pgsql: Add hstore_to_jsonb() and hstore_to_jsonb_loose() to hstore docu

Add hstore_to_jsonb() and hstore_to_jsonb_loose() to hstore documentation.

These were never documented anywhere user-visible. Tut tut.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b523a5c0e5329f7b9e1f15a189dda6936384e630

Modified Files
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doc/src/sgml/hstore.sgml | 26 +++++++++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)

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