Add mention that UTC really means UT1.

Backpatch to 9.1.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/7cb99b269667ef3d8869bc9f7681debc12c45b1d

Modified Files
--------------
doc/src/sgml/catalogs.sgml |    4 +++-
doc/src/sgml/func.sgml     |    4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)

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