quincy: doc/architecture: "Edit HA Auth"

[zdover23]

Rewrite the explanation of how a client authenticates against a monitor. This is a rewrite of a single paragraph, and has been set apart in its own PR so that it can receive the maximum amount of scrutiny that the upstream Ceph community can muster.

Co-authored-by: Anthony D'Atri anthony.datri@gmail.com
Signed-off-by: Zac Dover zac.dover@proton.me
(cherry picked from commit c71cd84)

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