chore: fixes phpstan issues

Author: abaicus

inc/compatibilities/essential_blocks.php

@@ -20,6 +20,8 @@ public function should_load() {
 
 	/**
 	 * Register integration details.
+	 *
+	 * @return void
 	 */
 	public function register() {
 		add_filter(

inc/compatibilities/kadence_blocks.php

@@ -21,6 +21,8 @@ public function should_load() {
 
 	/**
 	 * Register integration details.
+	 *
+	 * @return void
 	 */
 	public function register() {
 		add_filter(