Typo typo

src/Network/Response.php

@@ -1171,7 +1171,7 @@ class Response
     /**
      * Checks whether a response has not been modified according to the 'If-None-Match'
      * (Etags) and 'If-Modified-Since' (last modification date) request
-     * headers headers. If the response is detected to be not modified, it
+     * headers. If the response is detected to be not modified, it
      * is marked as so accordingly so the client can be informed of that.
      *
      * In order to mark a response as not modified, you need to set at least