Update media/upload API docs URL

Author: abraham

templates/index.html

@@ -126,7 +126,7 @@ <h3>POST</h3>
 
 
 <h3>Media</h3>
-<p>Upload images using <a href="https://dev.twitter.com/rest/public/uploading-media-multiple-photos">POST media/upload</a>.</p>
+<p>Upload images using <a href="https://dev.twitter.com/rest/reference/post/media/upload">POST media/upload</a>.</p>
 
 <pre>
 $connection = new TwitterOAuth(CONSUMER_KEY, CONSUMER_SECRET, $access_token, $access_token_secret);