docs: add info about requesting bootloaders

[Laikulo]

No description provided.

[KevinOConnor]

Thanks. Seems fine to me. I'll give a few days to see if others have comments.

I do have one question - see below.

-Kevin

[github-actions]

Thank you for your contribution to Klipper. Unfortunately, a reviewer has not assigned themselves to this GitHub Pull Request. All Pull Requests are reviewed before merging, and a reviewer will need to volunteer. Further information is available at: https://www.klipper3d.org/CONTRIBUTING.html

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1. Perform a self-review of your Pull Request by following the steps at: https://www.klipper3d.org/CONTRIBUTING.html#what-to-expect-in-a-review
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[KevinOConnor]

Thanks.

-Kevin