doc: add mention of ssi read anomolies to mvcc docs

Bruce Momjian <bruce@momjian.us>

Commit: 56a6317bf54625c7fdade6cd1ab38178bba42448
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-01-25T02:44:54Z
Releases: 9.3.0
doc:  add mention of ssi read anomolies to mvcc docs

From Jeff Davis, modified by Kevin Grittner

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doc/src/sgml/mvcc.sgml modified +17 −2