[L] Change in flashrom[main]: doc: Add docs how to add and update test status of flashchips

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Angel Pons, Nikolai Artemiev, Peter Marheine, Sergii Dmytruk, Stefan Reinauer, Thomas Heijligen.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/80205?usp=email )

Change subject: doc: Add docs how to add and update test status of flashchips
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Patch Set 4:

(1 comment)

File doc/contrib_howtos/how_to_add_new_chip.rst:

https://review.coreboot.org/c/flashrom/+/80205/comment/b229119a_4e6d03ad :
PS3, Line 86: abc
> nit: replace with `alphabetic`?
> Done