simplify hasScheme method

... and correct the mistake in docblock

Author: Artiom

src/Symfony/Component/Routing/Route.php

@@ -251,11 +251,23 @@ public function setSchemes($schemes)
         return $this;
     }
 
+    /**
+     * Checks if a scheme requirement has been set.
+     *
+     * @param string $scheme
+     *
+     * @return bool true if the scheme requirement exists, otherwise false
+     */
+    public function hasScheme($scheme)
+    {
+        return in_array(strtolower($scheme), $this->schemes, true);
+    }
+
     /**
      * Returns the uppercased HTTP methods this route is restricted to.
      * So an empty array means that any method is allowed.
      *
-     * @return array The schemes
+     * @return array The methods
      */
     public function getMethods()
     {