MB-14889: Don't send the user to membase docs page

Unfortunately this file is shared between the server version
and the old link sent you directly to the 1.8 server page
(which might not be the correct version). The new link takes
you to our docs portal where you may select the right server
version.

Change-Id: I15d9c381b76e296cade062e7efde54569d05be2b
Reviewed-on: http://review.couchbase.org/52423
Tested-by: buildbot <[email protected]>
Reviewed-by: Chiyoung Seo <[email protected]>

Author: trondn

docs/stats.org

@@ -16,8 +16,8 @@
 
 * Getting Started
 
-For introductory information on stats within membase, start with the
-[[http://wiki.membase.org/display/membase/Membase%2BStatistics][membase wiki stats page]].
+For introductory information on stats within Couchbase, start with the
+[[http://docs.couchbase.com/][Couchbase server documentations]].
 
 * Stats Definitions