Docs: Document many more parameters and properties using typed array notation.

See #41756

Built from https://develop.svn.wordpress.org/trunk@42871


git-svn-id: http://core.svn.wordpress.org/trunk@42701 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/update.php

@@ -600,7 +600,7 @@ function wp_maybe_auto_update() {
  *
  * @since 3.7.0
  *
- * @return array
+ * @return object[] Array of translation objects that have available updates.
  */
 function wp_get_translation_updates() {
 	$updates    = array();