Update alpha release notes for latest commits.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/f14ae5f905282109c9a2571c2048c564004f24c5

Modified Files
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doc/src/sgml/release-9.1.sgml |   49 ++++++++++++++++++++++++++--------------
1 files changed, 32 insertions(+), 17 deletions(-)

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Next:	From: Robert Haas	Date: 2011-03-09 05:06:41
	Subject: pgsql: Make alpha release notes more consistent as regards periods.
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	Subject: pgsql: A bit more editing for collation documentation.