pgsql: doc: mention dependency on collation libraries

doc: mention dependency on collation libraries

Document that index storage is dependent on the operating system's
collation library ordering, and any change in that ordering can create
invalid indexes.

Discussion: 20160617154311.GB19359@momjian.us

Backpatch-through: 9.1

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/2dc7da91054ee5135fae35fafe60bf2803d4d836

Modified Files
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doc/src/sgml/runtime.sgml | 9 +++++++++
1 file changed, 9 insertions(+)

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