docs comments: clarify why not to use UTF8 still in docs

Bruce Momjian <bruce@momjian.us>

Commit: 3960fa5f6396865ded34d9276324e9a31857cff1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-01T13:26:11Z
Releases: 11.0
docs comments:  clarify why not to use UTF8 still in docs

Back branches still are SGML.

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doc/src/sgml/release.sgml modified +4 −3

Documentation touched