pgsql: Remove obsolete advice about doubling backslashes in regex escap

Remove obsolete advice about doubling backslashes in regex escapes.

Standard-conforming literals have been the default for long enough that
it no longer seems necessary to go out of our way to tell people to write
regex escapes illegibly.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/fc0b8935213cda555d2b3af2ed08da28ed120e31

Modified Files
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doc/src/sgml/func.sgml | 10 ----------
1 file changed, 10 deletions(-)

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