docs: properly indent PG 12 release notes

Bruce Momjian <bruce@momjian.us>

Commit: a429164ef31fc6899cef4d5e4f3f2ce8fc33aa27
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-05-15T16:44:59Z
Releases: 12.0
docs:  properly indent PG 12 release notes

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doc/src/sgml/release-12.sgml modified +1280 −904

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