Docs: Add a description for the $table_prefix global.

Follow-up to [57748].

See #60699.

git-svn-id: https://develop.svn.wordpress.org/trunk@57787 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/upgrade.php

@@ -147,7 +147,7 @@ function wp_install( $blog_title, $user_name, $user_email, $is_public, $deprecat
 	 *
 	 * @global wpdb       $wpdb         WordPress database abstraction object.
 	 * @global WP_Rewrite $wp_rewrite   WordPress rewrite component.
-	 * @global string     $table_prefix
+	 * @global string     $table_prefix The database table prefix.
 	 *
 	 * @param int $user_id User ID.
 	 */

src/wp-includes/ms-blogs.php

@@ -489,7 +489,7 @@ function update_blog_option( $id, $option, $value, $deprecated = null ) {
  * @global int             $blog_id
  * @global array           $_wp_switched_stack
  * @global bool            $switched
- * @global string          $table_prefix
+ * @global string          $table_prefix       The database table prefix.
  * @global WP_Object_Cache $wp_object_cache
  *
  * @param int  $new_blog_id The ID of the blog to switch to. Default: current blog.
@@ -599,7 +599,7 @@ function switch_to_blog( $new_blog_id, $deprecated = null ) {
  * @global array           $_wp_switched_stack
  * @global int             $blog_id
  * @global bool            $switched
- * @global string          $table_prefix
+ * @global string          $table_prefix       The database table prefix.
  * @global WP_Object_Cache $wp_object_cache
  *
  * @return bool True on success, false if we're already on the current blog.