FAQ.rst : Adding information about missing test.

Adding ``review/gitmate/manual/pr`` to the list
of tests that are executed before any pull
request is approved.
Closes coala#580

Help/FAQ.rst

@@ -136,6 +136,11 @@ our master branch. Right now we use 7 of those checks:
  it all documented
  `here <http:https://api.coala.io/en/latest/Developers/Review.html>`_.
 
+- **review/gitmate/manual/pr** This is a manual process in which the pull request
+ can be reviewed by any coala member. Once the pull request is reviewed and 
+ approved, it is ready to be merged into the master branch. Post approval, it will 
+ be labeled with a ``process`` label marked as ``approved``.
+
 - **codecov/project** This one checks whether all your code is being tested. We
  cannot merge anything that may not work or may broke somewhere, so to avoid
  obvious bugs we use this. To fix it, write doctests or unittests for your