pgsql: docs: add "serialization anomaly" to transaction isolation tabl

docs: add "serialization anomaly" to transaction isolation table

Also distinguish between SQL-standard and Postgres behavior.

Report by David G. Johnston

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/23c33198b961f27c80655a7cf439d49ef5a1833d

Modified Files
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doc/src/sgml/mvcc.sgml | 67 ++++++++++++++++++++++++++++++++++--------------
1 file changed, 48 insertions(+), 19 deletions(-)

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