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

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

Report by Tomas Vondra

Backpatch through 9.5

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/6d8b2aa83af70e20323caf23961667dc4c149276

Modified Files
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doc/src/sgml/textsearch.sgml | 80 ++++++++++--------------------------------
1 file changed, 19 insertions(+), 61 deletions(-)

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