Optimizer items in the release notes

We had a discussion in October about adding more optimizer items to the
release notes:

    https://www.postgresql.org/message-id/flat/20181010220601.GA7807%40momjian.us#11d805ea0b0fcd0552dfa99251417cc1

There was no agreement on a change, but if people want to propose a
change, please post here and we can discuss it.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +