pgsql: Document errhidecontext() where it ought to be documented.

Document errhidecontext() where it ought to be documented.

Seems to have been missed when this function was added. Noted while
looking at David Steele's proposal to add another similar function.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e5a4dea80f2506a7a565508e48aaa52296ff410a

Modified Files
--------------
doc/src/sgml/sources.sgml | 9 +++++++++
src/backend/utils/error/elog.c | 2 +-
2 files changed, 10 insertions(+), 1 deletion(-)

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