[M] Change in coreboot[master]: Documentation/measured_boot.md: document new TPM options

[Martin Roth (Code Review)]

Attention is currently required from: Daniel P. Smith, Maciej Pijanowski, Maximilian Brune, Krystian Hebel, Sergii Dmytruk.

Martin Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/68752 )

Change subject: Documentation/measured_boot.md: document new TPM options
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Patch Set 15:

(1 comment)

File Documentation/security/vboot/measured_boot.md:

https://review.coreboot.org/c/coreboot/+/68752/comment/570acde2_0d327225 
PS15, Line 80: There are three supported formats of event logs:
Questions that could be answered in a follow-on patch:

Do we select between the different options or does coreboot just generate all 3.
If it's selectable, why would someone prefer one format to another