lnrpc: Clarify payment_addr and payment_secret

[tdb3]

Fix #7438, adding clarification statements in lnrpc proto files. Originally proposed by daredevil3435 in PR #7873 and PR #7885.

Change Description

The usage of "payment address" over "payment secret" appears to have caused some confusion among users. This PR attempts to provide a minimal change to provide clarity, focusing on comment wording rather than functional code changes.
As PR #7885 appears to be dormant, this PR attempts to move forward with the clarification changes.

Steps to Test

Possibly N/A, comment update. make rpc is successful.

Pull Request Checklist

Testing

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• Tests covering the positive and negative (error paths) are included.
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[guggero]

Thanks, LGTM 🎉

[ellemouton]

Nice - LGTM!