[S] Change in coreboot[main]: Documentation: add Nitrokey to distributions

[Michał Żygowski (Code Review)]

Attention is currently required from: Markus Meissner, Patrick Georgi, Paul Menzel.

Michał Żygowski has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/78299?usp=email )

Change subject: Documentation: add Nitrokey to distributions
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Patch Set 3:

(1 comment)

File Documentation/distributions.md:

https://review.coreboot.org/c/coreboot/+/78299/comment/d2aa2d1c_b3a8ca01 :
PS3, Line 23: offers a range of laptops, PCs, HSM, and networking devices with coreboot and
            : [Dasharo](https://dasharo.com/).
> In fact the HSMs is running Coreboot, it's a network HSM, called NetHSM running a coreboot (on a her […]

Apologies for my ignorance, I guess I haven't checked your device offer deep enough.

Then disregard this comment please and simply change `HSM` to `HSMs`, to be consistent with other devices expressed in plural. Nobody says you will keep offering only a single HSM model forever, right?