Bug#1029211: debian-policy: Add mention of the new non-free-firmware archive area

[James Addison <jay@jp-hosting.net>]

Package: debian-policy
Followup-For: Bug #1029211

Hi Gunnar,

Please find linked below two edits based on initial proofreading of your patch:

 - https://salsa.debian.org/jayaddison/policy/-/commit/775f589a7cf0c27ee7103eec7a16b29eccbf3d02

 - https://salsa.debian.org/jayaddison/policy/-/commit/0f893cbd70520beba404d56f9c4172e94e3be721

(the former results in duplicate footnotes.. perhaps there's a good way to
resolve that, somehow?)

Thanks,
James