Log Message:-----------CSV NULL Documentation
Update docs to clearly explain NULL value matching behavior, per Andrew.
Backpatch to 8.4.X.
Modified Files:-------------- pgsql/doc/src/sgml/ref: copy.sgml (r1.88 -> r1.89) (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/copy.sgml?r1=1.88&r2=1.89)
