Clean up markdown

docs/framework/templates/extending-smarty.md

@@ -3,30 +3,21 @@
 The Smarty templating language that is used to output the HTML for
 CiviCRM's templates is fairly powerful in its own right, but sometimes
 it can't do everything you want.  Smarty can be extended using "plugins"
--- you can find some examples and documentation online at [Smarty's
-website](http://www.smarty.net){.external-link} or by searching the web.
+-- you can find some examples and documentation online at [Smarty's website](http://www.smarty.net) or by searching the web.
 
 To install Smarty plugins without editing CiviCRM core (which is
-difficult to maintain), you will have to implement the
-hook_civicrm_config hook.  (Activating hooks in Drupal and Joomla is
-covered
-[here](http://wiki.civicrm.org/confluence/display/CRMDOC/CiviCRM+hook+specification#CiviCRMhookspecification-Proceduresforimplementinghooks%28forDrupal%29)).
+difficult to maintain), you will have to implement 
+[hook_civicrm_config](/hooks/hook_civicrm_config.md).
 
 Once you've created your module or hook file, you can retrieve the
 Smarty object and register your custom plugin path:
 
-<div class="code panel" style="border-width: 1px;">
-
-<div class="codeContent panelContent">
-
-    function yourmodule_civicrm_config(&$config) {
-        $smarty = CRM_Core_Smarty::singleton();
-        array_push($smarty->plugins_dir, __DIR__ . '/relative/path/to/custom/plugin/directory');
-    }
-
-</div>
-
-</div>
+```php
+function yourmodule_civicrm_config(&$config) {
+  $smarty = CRM_Core_Smarty::singleton();
+  array_push($smarty->plugins_dir, __DIR__ . '/relative/path/to/custom/plugin/directory');
+}
+```
 
 Then in that custom plugin directory, you can place whatever Smarty
 plugins you need.
@@ -34,18 +25,14 @@ plugins you need.
 You can also use this trick to change other Smarty behavior, such as
 whether it can evaluate PHP placed directly in templates. For instance:
 
-<div class="code panel" style="border-width: 1px;">
-
-<div class="codeContent panelContent">
-
-    function yourmodule_civicrm_config(&$config) {
-        $smarty = CRM_Core_Smarty::singleton();
-        array_push($smarty->security_settings['MODIFIER_FUNCS'], 'explode'); // allow the explode() php function to be used as a "modifier" in Smarty templates
-    }
-
-</div>
-
-</div>
+```php
+function yourmodule_civicrm_config(&$config) {
+  $smarty = CRM_Core_Smarty::singleton();
+  
+  // allow the explode() php function to be used as a "modifier" in Smarty templates
+  array_push($smarty->security_settings['MODIFIER_FUNCS'], 'explode'); 
+}
+```
 
 However, be very careful with these settings – if you don't know what
 you're doing, you can open security holes or create a mess of code