docs: add @return explanations

Author: kenjis

system/Common.php

@@ -952,7 +952,7 @@ function response(): ResponseInterface
      * @param int|string ...$params One or more parameters to be passed to the route.
      *                              The last parameter allows you to set the locale.
      *
-     * @return false|string
+     * @return false|string The route (URI path relative to baseURL) or false if not found.
      */
     function route_to(string $method, ...$params)
     {

system/Router/RouteCollection.php

@@ -1044,7 +1044,7 @@ public function environment(string $env, Closure $callback): RouteCollectionInte
      * @param int|string ...$params One or more parameters to be passed to the route.
      *                              The last parameter allows you to set the locale.
      *
-     * @return false|string
+     * @return false|string The route (URI path relative to baseURL) or false if not found.
      */
     public function reverseRoute(string $search, ...$params)
     {

system/Router/RouteCollectionInterface.php

@@ -172,7 +172,7 @@ public function getHTTPVerb();
      * @param string     $search    Named route or Controller::method
      * @param int|string ...$params
      *
-     * @return false|string
+     * @return false|string The route (URI path relative to baseURL) or false if not found.
      */
     public function reverseRoute(string $search, ...$params);