Update note that CI docs are out of date

Author: pradyunsg

docs/html/development/ci.rst

@@ -1,7 +1,8 @@
 .. note::
 
-    This section of the documentation is currently being written. pip
-    developers welcome your help to complete this documentation. If
+    This section of the documentation is currently out of date.
+
+    pip developers welcome your help to update this documentation. If
     you're interested in helping out, please let us know in the
     `tracking issue`_, or just submit a pull request and mention it in
     that tracking issue.