Log Message:-----------Add lock matrix to documentation.
Teodor Sigaev
Modified Files:-------------- pgsql/doc/src/sgml: mvcc.sgml (r2.66 -> r2.67) (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/mvcc.sgml.diff?r1=2.66&r2=2.67)