Merge branch 'ginkgomzd-master-patch-87488' into 'master'

add note about wkhtmltopdf (aka, optional requirements for jumbo shrimp)

See merge request documentation/docs/installation!30

docs/general/requirements.md

@@ -25,6 +25,12 @@ If your server meets all of the requirements described on this page, CiviCRM *sh
 
 In general, CiviCRM is a demanding web application which requires substantial server resources. It may not perform well on all hosting platforms. Learn more about [choosing your hosting platform](../planning/hosting.md).
 
+### Optional Libraries
+
+Some people report better performance in some circumstances when rendering PDF files (e.g. reports or invoices). CiviCRM has a configuration option to use a system binary for WKHTMLtoPDF. [https://wkhtmltopdf.org/](https://wkhtmltopdf.org/) You can find this setting under "System Settings" > "Misc".
+
+Another reason to use it is that is solves [the issue](unicode_pdf.md) of how to handle unicode fonts needed for some languages.
+
 ## CMS {:#cms}
 
 A CMS, or Content Management System, is a type of application which controls and manages the content of a website. CiviCRM must be installed within one of these compatible CMS platforms.