[L] Change in flashrom[main]: doc: Convert write-protect docs to sphinx

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Sergii Dmytruk, Thomas Heijligen.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/78113?usp=email )

Change subject: doc: Convert write-protect docs to sphinx
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Patch Set 1:

(1 comment)

Patchset:

PS1: 
Sergii, I have re-formatted these docs from wiki, I kept the same content, maybe you can have a look whether it's still true?
I think it is still all true, but there are few paragraphs which say "as of November 2022", maybe those need checking. Thank you!