Update the release strategy for 3.2

Update the release strategy for 3.2

1.1.1 is no longer supported - references to the "current" version scheme
for 1.1.1 are out dated.

We add the support dates for 3.2

Reviewed-by: Anton Arapov <anton@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/web/pull/444)