pgsql: More work on the JSON/JSONB user documentation.

More work on the JSON/JSONB user documentation.

Document existence operator adequately; fix obsolete claim that no
Unicode-escape semantic checks happen on input (it's still true for
json, but not for jsonb); improve examples; assorted wordsmithing.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f825c7c850dbe683d62defd7e5bd31664ee3302c

Modified Files
--------------
doc/src/sgml/func.sgml | 182 ++++++++++++-------------
doc/src/sgml/gin.sgml | 1 +
doc/src/sgml/json.sgml | 347 ++++++++++++++++++++++++++++++------------------
3 files changed, 311 insertions(+), 219 deletions(-)

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