Add missing inline descriptions.

props momo360modena, aaronholbrook.
see #20494, fixes #23304.

git-svn-id: http://core.svn.wordpress.org/trunk@23350 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/comment.php

@@ -7,7 +7,7 @@
  */
 
 /**
- * {@internal Missing Short Description}}
+ * Determine if a comment exists based on author and date.
  *
  * @since 2.0.0
  * @uses $wpdb
@@ -68,11 +68,11 @@ function edit_comment() {
 }
 
 /**
- * {@internal Missing Short Description}}
+ * Returns a comment object based on comment ID.
  *
  * @since 2.0.0
  *
- * @param int $id ID of comment to retrieve
+ * @param int $id ID of comment to retrieve.
  * @return bool|object Comment if found. False on failure.
  */
 function get_comment_to_edit( $id ) {