Add missing doc blocks to wp-admin/includes/*.

Fix some egregious uses of tabbing.
Some functions can simply return `apply_filters(...)` instead of setting a variable that is immediately returned.

See #32444.

Built from https://develop.svn.wordpress.org/trunk@32654


git-svn-id: http://core.svn.wordpress.org/trunk@32624 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/bookmark.php

@@ -77,7 +77,7 @@ function get_default_link_to_edit() {
  * @global wpdb $wpdb
  *
  * @param int $link_id ID of the link to delete
- * @return bool True
+ * @return true
  */
 function wp_delete_link( $link_id ) {
 	global $wpdb;
@@ -140,7 +140,7 @@ function get_link_to_edit( $link_id ) {
  * @global wpdb $wpdb
  *
  * @param array $linkdata Elements that make up the link to insert.
- * @param bool $wp_error Optional. If true return WP_Error object on failure.
+ * @param bool  $wp_error Optional. If true return WP_Error object on failure.
  * @return int|WP_Error Value 0 or WP_Error on failure. The link ID on success.
  */
 function wp_insert_link( $linkdata, $wp_error = false ) {