Use void instead of null where appropriate when pipe-delimiting @return types. If a @return only contains void, remove it.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32568 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/canonical.php

@@ -36,7 +36,7 @@
  * @param string $requested_url Optional. The URL that was requested, used to
  *		figure if redirect is needed.
  * @param bool $do_redirect Optional. Redirect to the new URL.
- * @return null|string Null, if redirect not needed, or the string of the URL
+ * @return string|void The string of the URL, if redirect needed.
  */
 function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 	global $wp_rewrite, $is_IIS, $wp_query, $wpdb;