Fix quotes in exception messages

Author: fabpot

Loader/FileLoader.php

@@ -57,7 +57,7 @@ public function import($resource, $type = null, $ignoreErrors = false, $sourceRe
         if ($ignoreNotFound = 'not_found' === $ignoreErrors) {
             $args[2] = false;
         } elseif (!\is_bool($ignoreErrors)) {
-            throw new \TypeError(sprintf('Invalid argument $ignoreErrors provided to %s::import(): boolean or "not_found" expected, %s given.', static::class, \gettype($ignoreErrors)));
+            throw new \TypeError(sprintf('Invalid argument $ignoreErrors provided to "%s::import()": boolean or "not_found" expected, "%s" given.', static::class, \gettype($ignoreErrors)));
         }
 
         try {