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

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Thomas Heijligen.

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

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

(3 comments)

File doc/user_docs/example_partial_wp.rst:

https://review.coreboot.org/c/flashrom/+/78113/comment/36705db7_c3823e74 :
PS1, Line 102: control
`(sector/block-based)` can be added after `control` because I had to pause for a moment to recall what this is referring to.

https://review.coreboot.org/c/flashrom/+/78113/comment/5d8b6a46_d94a9199 :
PS1, Line 103: 4 November 2022
Block-based write-protection isn't supported as of today, so the date can be updated accordingly.

File doc/user_docs/fw_updates_vs_spi_wp.rst:

https://review.coreboot.org/c/flashrom/+/78113/comment/a60ccc64_cb3e24c5 :
PS1, Line 62: 4 November 2022)
CB:69517 changed the behaviour to use WP code and and then old implementation as a fallback.  So the paragraph can be removed (especially if that change is part of v1.3).