[COMMITTERS] pgsql: Add note that TRUNCATE is not MVCC-safe.

[Tom Lane]

Log Message:
-----------
Add note that TRUNCATE is not MVCC-safe.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        truncate.sgml (r1.22 -> r1.23)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/truncate.sgml.diff?r1=1.22&r2=1.23)

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