doc: update PG 10 release notes

Bruce Momjian <bruce@momjian.us>

Commit: 5469e44ffc2077cb8371686497022cb5afd1af87
Author: Bruce Momjian <bruce@momjian.us>
Date: 2017-05-05T00:33:06Z
Releases: 10.0
doc:  update PG 10 release notes

Mention vacuum verbose includes oldest xmin, BRIN index usage
estimation, and multi-column statistics.

Reported-by: Masahiko Sawada, Alvaro Herrera

Files

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doc/src/sgml/release-10.sgml modified +18 −4

Documentation touched