Polishing docs for manual authentication

[frisso]

No description provided.

[adamjensenbot]

Hi @frisso. Thanks for your PR!

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[frisso]

To me, there's still a bit of confusion between the terms "pairing" and "peering". We should clarify when to use one, and when to use the other.

[frisso]

Waiting for PR #2827 to be merged in order to cleanup also the other sections of the 'manual peering' documentation.

[frisso]

/rebase