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_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/9b3477c9ba1497fe6fafeab5c2dbf6d59c92ec6d

Modified Files
--------------
doc/src/sgml/array.sgml | 27 ++----------------
doc/src/sgml/datatype.sgml | 71 +++++++++++++++++++++++++++-------------------
doc/src/sgml/func.sgml | 48 +++++++++++++++----------------
doc/src/sgml/lobj.sgml | 4 +--
doc/src/sgml/rowtypes.sgml | 2 +-
5 files changed, 72 insertions(+), 80 deletions(-)