Make the unknown board ID warning more accurate and helpful.
Make the unknown board ID warning more accurate and helpful.

mesheven/pyOCD,mbedmicro/pyOCD,flit/pyOCD,mbedmicro/pyOCD,pyocd/pyOCD,mbedmicro/pyOCD,pyocd/pyOCD,flit/pyOCD,mesheven/pyOCD,mesheven/pyOCD