Update documentation to state there is three-value logic, not
three-value boolean logic.

Backpatch to 9.0.X since we just got another bug report about this
today.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/832c095d686e89f6390e0ff3e91b4c8015c2c3f7

Modified Files
--------------
doc/src/sgml/func.sgml |    5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-05-10 03:26:04
	Subject: pgsql: Documentation cleanup for the possible values of the datatype'b
Previous:	From: Tom Lane	Date: 2011-05-09 15:01:11
	Subject: pgsql: Remove "make check" target in src/test/isolation/Makefile.