doc: move hash performance item into index section

Bruce Momjian <bruce@momjian.us>

Commit: cef5dbbf2b8d8a5e7b536bcbf6d9066588c6173b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2017-04-25T03:29:14Z
Releases: 10.0
doc:  move hash performance item into index section

The requirement to rebuild pg_upgrade-ed hash indexes was kept in the
incompatibilities section.

Reported-by: Amit Kapila

Files

PathChange+/−
doc/src/sgml/release-10.sgml modified +27 −15

Documentation touched