docs/helpwanted: fix GL3.txt/features.txt link

Fixes: f926cf5bd0ade3273b32 ("docs: Rename GL3.txt to features.txt")

Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
CC: Andreas Boll <andreas.boll.dev@gmail.com>
diff --git a/docs/helpwanted.html b/docs/helpwanted.html
index 859e65c..0660a9e 100644
--- a/docs/helpwanted.html
+++ b/docs/helpwanted.html
@@ -56,8 +56,8 @@
 <b>Common To-Do lists:</b>
 </p>
 <ul>
-  <li><a href="http://cgit.freedesktop.org/mesa/mesa/tree/docs/GL3.txt">
-    <b>GL3.txt</b></a> - Status of OpenGL 3.x / 4.x features in Mesa.</li>
+  <li><a href="http://cgit.freedesktop.org/mesa/mesa/tree/docs/features.txt">
+    <b>features.txt</b></a> - Status of OpenGL 3.x / 4.x features in Mesa.</li>
   <li><a href="http://dri.freedesktop.org/wiki/MissingFunctionality">
     <b>MissingFunctionality</b></a> - Detailed information about missing OpenGL features.</li>
 </ul>