Document timestamptz a little better.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=afc8f47b5885716db716a2523c00f7465cb7f415

Modified Files
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doc/src/sgml/datatype.sgml |    7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)

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