Log Message:
-----------
Adjust error message to agree with documentation. The tsearch documentation
uniformly calls these things weights, not classes.
Modified Files:
--------------
pgsql/src/backend/utils/adt:
tsginidx.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/tsginidx.c?r1=1.4&r2=1.5)