Add a reference to the release rotation wiki, and clarify that
the current stable release schedule is every-other-week.
Fixes: #337
Signed-off-by: Eric Ernst <eric.ernst@intel.com>
It is expected that this document will change over time. This
represents an initial starting point as we create and release
our stable branches.
Fixes: #237
Signed-off-by: Eric Ernst <eric.ernst@intel.com>