doc: PG 11 rel notes: add PL/pgSQL composite DDL item

Bruce Momjian <bruce@momjian.us>

Commit: 0c7e6b791a316431fb206a9ae2184377c4296995
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-24T02:06:31Z
Releases: 11.0
doc:  PG 11 rel notes:  add PL/pgSQL composite DDL item

Reported-by: Tom Lane

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doc/src/sgml/release-11.sgml modified +17 −0

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