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

See #41756

Built from https://develop.svn.wordpress.org/trunk@42876


git-svn-id: http://core.svn.wordpress.org/trunk@42706 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class.wp-styles.php

@@ -306,7 +306,7 @@ class WP_Styles extends WP_Dependencies {
 			 *
 			 * @since 2.6.0
 			 *
-			 * @param array $to_do The list of enqueued styles about to be processed.
+			 * @param string[] $to_do The list of enqueued style handles about to be processed.
 			 */
 			$this->to_do = apply_filters( 'print_styles_array', $this->to_do );
 		}