Update the configuration docs for the revocation extension

There was a formatting error in how step 1 appeared, and I also
changed the title to the more formal name instead of OS-REVOKE,
as the other extensions did not use their OS-* name.

Change-Id: I658ac8dc61d6a8cdacb243a10d853cf9f6aa9409
Merge "Update the configuration docs for the revocation extension"