Add a note to the MVCC chapter that some things aren't transactional.

Craig Ringer, slightly edited by me.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/82ef3d3008f8ec9c565f7a5724196cd0f342d594

Modified Files
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doc/src/sgml/mvcc.sgml |   12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

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