pgsql: Add "(assuming <varname>standard_conforming_strings</> is

Log Message:
-----------
Add "(assuming <varname>standard_conforming_strings</> is
<literal>off</>)" clauses for bytea.

Modified Files:
--------------
pgsql/doc/src/sgml:
datatype.sgml (r1.180 -> r1.181)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datatype.sgml.diff?r1=1.180&amp;r2=1.181)