Fix typo in documentation
Fix typo in documentation

The documentation says that a 'true' to ck_assert(_msg) will result
in a test failure. It should say 'false' instead.

Issue #3597793

git-svn-id: ae38cf1093b87151f738d2b2220cac7742ad2e55@682 64e312b2-a51f-0410-8e61-82d0ca0eb02a

lubosz/check,lubosz/check,lubosz/check,lubosz/check