Clarify that \Illuminate\Http\Request::replace replace all input valu…

…es (#51123)

By adding "values" it clarify that this method replaces the current input values by a new set.

src/Illuminate/Http/Request.php

@@ -368,7 +368,7 @@ public function mergeIfMissing(array $input)
     }
 
     /**
-     * Replace the input for the current request.
+     * Replace the input values for the current request.
      *
      * @param  array  $input
      * @return $this