pgsql: docs: remove use of escape strings and use bytea hex output

docs: remove use of escape strings and use bytea hex output

standard_conforming_strings defaulted to 'on' in PG 9.1.
bytea_output defaulted to 'hex' in PG 9.0.

Reported-by: André Hänsel

Discussion: /messages/by-id/12e601d447ac$345994a0$9d0cbde0$@webkr.de

Backpatch-through: 9.3

Branch
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REL9_3_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/dabdc7e903e06448670af19865f5386549766eb6

Modified Files
--------------
doc/src/sgml/array.sgml | 27 ++----------------
doc/src/sgml/datatype.sgml | 71 +++++++++++++++++++++++++++-------------------
doc/src/sgml/func.sgml | 48 +++++++++++++++----------------
doc/src/sgml/rowtypes.sgml | 2 +-
4 files changed, 70 insertions(+), 78 deletions(-)