doc: update PG 11 rel. notes for ALTER TABLE's non-null default

Bruce Momjian <bruce@momjian.us>

Commit: 8c6227a2f3cdf144c4de135329fd76eb66f5684a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-13T00:46:37Z
Releases: 11.0
doc:  update PG 11 rel. notes for ALTER TABLE's non-null default

Reported-by: Peter Geoghegan

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doc/src/sgml/release-11.sgml modified +2 −2

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