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: https://postgr.es/m/12e601d447ac$345994a0$9d0cbde0$@webkr.de

Backpatch-through: 9.3

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f77de4b0c0ad8c351223929b6fb3ee5c300a9979

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(-)