Fix quotes in exception messages

Author: fabpot

Loader/ObjectLoader.php

@@ -57,7 +57,7 @@ public function load($resource, $type = null)
         $loaderObject = $this->getObject($parts[0]);
 
         if (!\is_object($loaderObject)) {
-            throw new \TypeError(sprintf('%s:getObject() must return an object: %s returned.', static::class, \gettype($loaderObject)));
+            throw new \TypeError(sprintf('"%s:getObject()" must return an object: "%s" returned.', static::class, \gettype($loaderObject)));
         }
 
         if (!\is_callable([$loaderObject, $method])) {
@@ -69,7 +69,7 @@ public function load($resource, $type = null)
         if (!$routeCollection instanceof RouteCollection) {
             $type = \is_object($routeCollection) ? \get_class($routeCollection) : \gettype($routeCollection);
 
-            throw new \LogicException(sprintf('The %s::%s method must return a RouteCollection: %s returned.', \get_class($loaderObject), $method, $type));
+            throw new \LogicException(sprintf('The "%s::%s()" method must return a RouteCollection: "%s" returned.', \get_class($loaderObject), $method, $type));
         }
 
         // make the object file tracked so that if it changes, the cache rebuilds