Add doc blocks to functions that are missing them.

If the function has no need for `@param` or `@return`, do an archeaological dig to find `@since`.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32672 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/comment.php

@@ -167,6 +167,9 @@ function floated_admin_avatar( $name ) {
 	return "$avatar $name";
 }
 
+/**
+ * @since 2.7.0
+ */
 function enqueue_comment_hotkeys_js() {
 	if ( 'true' == get_user_option( 'comment_shortcuts' ) )
 		wp_enqueue_script( 'jquery-table-hotkeys' );