docs: update guidelines on when to use GIN and GiST indexes

Bruce Momjian <bruce@momjian.us>

Commit: 6d8b2aa83af70e20323caf23961667dc4c149276
Author: Bruce Momjian <bruce@momjian.us>
Date: 2015-10-05T17:38:36Z
Releases: 9.6.0
docs:  update guidelines on when to use GIN and GiST indexes

Report by Tomas Vondra

Backpatch through 9.5

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doc/src/sgml/textsearch.sgml modified +19 −61

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