Correct URL example used in Google Analytics Integration

We no longer use the '/Gerrit' prefix, but instead use just '/',
so this example is out of date.  Drop the /Gerrit portion from
the documentation.

Change-Id: Ie8588095030adb9ed9d214621b1604d0719ba7f8
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed