General: Remove discouraged @return void annotations.

Such `@return void` annotations must not be used in WordPress core's PHP code, except bundled themes, third-party libraries, and PHP compatibility shims.

Props isabel_brison, swissspidy.
Fixes #59619.

Built from https://develop.svn.wordpress.org/trunk@56943


git-svn-id: http://core.svn.wordpress.org/trunk@56454 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -776,8 +776,6 @@ final class WP_Theme implements ArrayAccess {
 	 * Perform reinitialization tasks.
 	 *
 	 * Prevents a callback from being injected during unserialization of an object.
-	 *
-	 * @return void
 	 */
 	public function __wakeup() {
 		if ( $this->parent && ! $this->parent instanceof self ) {