Add architecture binary information to the prerequisites

[yubiuser]

What does this PR aim to accomplish?:

Doc PR for https://github.com/pi-hole/pi-hole/pull/6022

Adds information about the architectures we provide a FTL binary for and how to skip the binary check.

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[yubiuser]

Needs https://github.com/pi-hole/pi-hole/pull/6022 to be released first.

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