Docs: Synchronize description for the $instance parameter in `WP_Wi…

…dget` methods.

Follow-up to [30382].

See #61608.

git-svn-id: https://develop.svn.wordpress.org/trunk@59196 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-widget.php

@@ -137,7 +137,7 @@ public function update( $new_instance, $old_instance ) {
 	 *
 	 * @since 2.8.0
 	 *
-	 * @param array $instance Current settings.
+	 * @param array $instance The settings for the particular instance of the widget.
 	 * @return string Default return is 'noform'.
 	 */
 	public function form( $instance ) {