qgaschema:document generic QERR_UNSUPPORTED ...wording was shamelessly stolen from Michael Roth's email. Suggested-by: Michael Roth <mdroth@linux.vnet.ibm.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>