releases: Mark 2.13 as a new LTS release.

2.5 release is 4.5 years old and I'm not aware of anyone who actually
uses it today.  Release process documentation says that there is no
strict time period for nominating a new LTS release and that usually
it happens once in a two years.  So, proposing to nominate 2.13 as
our new LTS release since it's a first release that doesn't include
OVN inside, so we will formally not have to support it in this
repository in case there are major issues that might be hard to fix.

Suggested-by: Ben Pfaff <blp@ovn.org>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Acked-by: Ian Stokes <ian.stokes@intel.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Documentation/faq/releases.rst

@@ -32,7 +32,7 @@ Q: What does it mean for an Open vSwitch release to be LTS (long-term support)?
     If a significant bug is identified in an LTS release, we will provide an
     updated release that includes the fix.  Releases that are not LTS may not
     be fixed and may just be supplanted by the next major release.  The current
-    LTS release is 2.5.x.
+    LTS release is 2.13.x.
 
     For more information on the Open vSwitch release process, refer to
     :doc:`/internals/release-process`.