Fixed incorrect code reference in error

When we suspect an incompatible schema version, we recommend:
misc.getSchemaVersion() which was moved to util.getSchemaVersion().

This changes the error message to reflect that.

+types/+util/checkUnset.m

@@ -15,7 +15,7 @@ function checkUnset(obj, argin)
     ['Unexpected properties {%s}.  '...
         '\n\nYour schema version may be incompatible with the file.  '...
         'Consider checking the schema version of the file with '...
-        '`misc.getSchemaVersion(filename)` '...
+        '`util.getSchemaVersion(filename)` '...
         'and comparing with the YAML namespace version present in '...
         'nwb-schema/core/nwb.namespace.yaml'], misc.cellPrettyPrint(dropped));
 end