One last round of copy-editing for the 9.1 release notes.

Also set the documented release date to 2011-09-12.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/09b68c70af855a0a69cede14da70968ddd97ba05

Modified Files
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doc/src/sgml/release-9.1.sgml |   81 ++++++++++++++++++++---------------------
1 files changed, 40 insertions(+), 41 deletions(-)

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