[M] Change in coreboot[main]: Documentation: Write down coreboot's git commit message rules

[Matt DeVillier (Code Review)]

Attention is currently required from: Jan Samek, Martin L Roth, Nicholas Chin, Paul Menzel.

Matt DeVillier has posted comments on this change by Martin L Roth. ( https://review.coreboot.org/c/coreboot/+/75495?usp=email )

Change subject: Documentation: Write down coreboot's git commit message rules
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Patch Set 4: Code-Review+2