docs: Fix FAQ link to Signing Blobs

[Almad]

Summary

Doc link results in 404.

Release Note

NONE

Documentation

This PR implements the doc change.

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[Almad]

(Accepted)

[smythp]

Hey @ltagliaferri, it looks like the part of the docs that this updated has been nuked during the reorg. I think it would be a shame if @Almad didn't get to merge in. I could create a new PR that includes this commit and resolves the merge conflict (though, really, there's no link to update anymore). We could also close this PR, with our apologies.

Thank you again for this helpful PR, and apologies for the reshuffle.

[haydentherapper]

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