Documentation: Update Protectli fw6b documentations

Update documentations:
- ME cleaner has been tested on the fw6b.
- More observations on the stock firmware is documented.
- Compatible boards are listed along with the original manufacturer.

Signed-off-by: Xue Yao <xueyao@xyte.ch>
Change-Id: I4938d81d57fc8172fefcc00222806fff0735d503
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63016
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

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