Simplify summary heading

When the first heading of the document says...

> "Scope of this guide and alternative installation methods"

It breaks my English parser, and I start to cry. Just a little. On the inside.

docs/backdrop/index.md

-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing Backdrop site. It assumes that you previously completed these tasks:
 
-## Before installing
+    1. [Install Backdrop](https://backdropcms.org/installation), and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install Backdrop by referring to the [Backdrop Installation Guide](https://backdropcms.org/installation) if needed.
+!!! tldr "Similar alternatives"
+
+    If you plan to develop patches for CiviCRM on WordPress, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 ## Determine Backdrop Database Settings {:#db-settings}
 

docs/drupal7/index.md

-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing Drupal 7 site. It assumes that you previously completed these tasks:
 
-## Before installing
+    1. [Install Drupal 7](https://www.drupal.org/docs/7/install), and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install Drupal 7 by referring to the [Drupal 7 Installation Guide](https://www.drupal.org/docs/7/install) if needed.
+!!! tldr "Similar alternatives"
+
+    If you plan to develop patches for CiviCRM on Drupal 7, then please use the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 ## Determine Drupal Database Settings {:#db-settings}
 

docs/drupal8/index.md

-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing Drupal 8 site. It assumes that you previously completed these tasks:
 
-## Before installing
+    1. [Install Drupal 8](https://www.drupal.org/docs/8/install), and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install Drupal 8 by referring to the [Drupal 8 Installation Guide](https://www.drupal.org/docs/8/install) if needed.
+!!! tldr "Similar alternatives"
+
+    If you plan to develop patches for CiviCRM on Drupal 8, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 !!! warning "Composer install required!"
     This guide will assume that you have installed Drupal 8 using composer. At this time manual installation of Drupal 8 using zip or tarball install methods is not supported.

docs/drupal9/index.md

@@ -4,14 +4,16 @@
     document, but it has not been carefully reviewed/tested. Consequently, it is not linked in
     the main menu.
 
-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing Drupal 9 site. It assumes that you previously completed these tasks:
 
-## Before installing
+    1. Install Drupal 9, and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install Drupal 9 by referring to the [Drupal 8 Installation Guide](https://www.drupal.org/docs/8/install) if needed.
+!!! tldr "Similar alternatives"
+
+    If you plan to develop patches for CiviCRM on Drupal 9, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 !!! warning "Composer install required!"
     This guide will assume that you have installed Drupal 9 using composer. At this time manual installation of Drupal 8 using zip or tarball install methods is not supported.

docs/joomla/index.md

-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing Joomla site. It assumes that you previously completed these tasks:
 
-## Before installing
-
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install Joomla by referring to the [Joomla Installation Guide](https://docs.joomla.org/J3.x:Installing_Joomla) if needed.
+    1. [Install Joomla](https://docs.joomla.org/J3.x:Installing_Joomla), and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
 !!! note "Path for Joomla"
     The rest of these instructions assume that you have Joomla installed in `/var/www/JOOMLA_ROOT`. Adjust paths as needed.

docs/wordpress/index.md

-## Scope of this guide and alternative installation methods
+!!! tldr "About this document"
 
-This guide covers standard installation of CiviCRM for production use. For installing a development environment, refer to the [section on Buildkit in the Developer Documentation](https://docs.civicrm.org/dev/en/latest/tools/buildkit/).
+    This guide covers standard installation of CiviCRM on an existing WordPress site. It assumes that you previously completed these tasks:
 
-## Before installing
+    1. [Install WordPress](https://wordpress.org/support/article/how-to-install-wordpress/), and...
+    1. [Review the CiviCRM requirements](../general/requirements.md)
 
-1. Ensure that your system meets the [requirements](../general/requirements.md).
-1. Install WordPress by referring to the [WordPress Installation Guide](https://wordpress.org/support/article/how-to-install-wordpress/) if needed.
+!!! tldr "Similar alternatives"
+
+    If you plan to develop patches for CiviCRM on WordPress, then please read the [Developer Guide](https://docs.civicrm.org/dev/en/latest) for information about [Buildkit](https://docs.civicrm.org/dev/en/latest/tools/buildkit/) and [civibuild](https://docs.civicrm.org/dev/en/latest/tools/civibuild/).
 
 !!! note "Path for WordPress"
     The rest of these instructions assume that you have WordPress installed in `/var/www/wordpress`. Adjust paths as needed.