Clarification to catalog-pg-class

All,

Currently, catalog-pg-class is a bit confusing as to where FKs are
tracked in pg_class.  Please update the lines for relchecks and
reltriggers to read:

relchecks    int2          Number of check constraints on the table (but not
other types of constraints); see pg_constraint catalog
reltriggers    int2         Number of triggers on the table, including
constraint-triggers for foreign keys; see pg_trigger catalog

--Josh Berkus