docs/siteconfig.rst: consistency
docs/siteconfig.rst: consistency

Change "count: 0" to "count: 3" for consistency with the comment.

Signed-off-by: Nathan Cutler <f9d8c66a4e898e67db786769b5b347b640e1a9a6@suse.com>

dmick/teuthology,SUSE/teuthology,SUSE/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,dmick/teuthology,ceph/teuthology,ktdreyer/teuthology,ktdreyer/teuthology