Create "replication and recovery" section in alpha release notes.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/51c0124481213eab45db193929614070da7b60d1

Modified Files
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doc/src/sgml/release-9.1.sgml |  109 ++++++++++++++++++++++-------------------
1 files changed, 59 insertions(+), 50 deletions(-)

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