Change in coreboot[master]: Docs/mb/lenovo/t420: Added information what's tested and works.

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Change subject: Docs/mb/lenovo/t420: Added information what's tested and works.
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/51952/comment/d331ceee_5a895df1 
PS1, Line 7: Added
> Commit messages should be written in present tense: *Add* information... […]

Like: „Add general usage information” or „Add Working/TODOs hardware info”?

Commit Message:

https://review.coreboot.org/c/coreboot/+/51952/comment/bb09fb60_3dabd7ee 
PS3, Line 7: .
> nit: no trailing period in the commit summary

Ok. :) Will fix that when we resolve summary.