Add prefix cache plugin configuration guide

[liu-cong]

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[nirrozenbaum]

is the link not pointing to main intentionally?

[liu-cong]

this is a permanent link. Main can change.

[nirrozenbaum]

do we expect every plugin to have this kind of configuration guide?

[liu-cong]

do we expect every plugin to have this kind of configuration guide?

I think in general yes. We should have a doc listing the configuration options and explain what they are. This PR focuses on prefix plugin only though. This is more user/operator facing and we don't expect them to read the code.

[ahg-g]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, liu-cong

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