Ensure inline code is markdown-escaped as such, and that code snippets in descriptions are properly indented.

Affects DocBlocks for the following core elements:
* Two arguments in `_walk_bookmarks()`
* A code snippet in the class header for `WP_Roles`
* A code snippet in the class header for `WP_HTTP_Proxy`
* Inline code fixes in the summary and a parameter description for `WP_oEmbed::discover()`
* An argument description in `_WP_Editors::parse_settings()`
* Inline code fixes in the summary and a parameter description the `embed_oembed_discover` hook.

Props rarst.
See #30473.


git-svn-id: https://develop.svn.wordpress.org/trunk@30536 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/capabilities.php

@@ -13,14 +13,12 @@
  * the name in value of the 'name' key. The capabilities are stored as an array
  * in the value of the 'capability' key.
  *
- * <code>
- * array (
- *		'rolename' => array (
- *			'name' => 'rolename',
- *			'capabilities' => array()
- *		)
- * )
- * </code>
+ *     array (
+ *    		'rolename' => array (
+ *    			'name' => 'rolename',
+ *    			'capabilities' => array()
+ *    		)
+ *     )
  *
  * @since 2.0.0
  * @package WordPress