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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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/7d88b3d154444fe102ef6a006f1234025e91c7fa

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

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