lnrpc: fix lncli documentation tags in walletkit.proto

[feelancer21]

Fixes the tag for wallet pendingsweeps and adds the tag for wallet estimatefeerate.

Change Description

fixes #9156

I think no change log required. But CI should run for rpc check.

Steps to Test

Steps for reviewers to follow to test the change.

Pull Request Checklist

Testing

• Your PR passes all CI checks.
• Tests covering the positive and negative (error paths) are included.
• Bug fixes contain tests triggering the bug to prevent regressions.

Code Style and Documentation

• The change obeys the Code Documentation and Commenting guidelines, and lines wrap at 80.
• Commits follow the Ideal Git Commit Structure.
• Any new logging statements use an appropriate subsystem and logging level.
• Any new lncli commands have appropriate tags in the comments for the rpc in the proto file.
• There is a change description in the release notes, or [skip ci] in the commit message for small changes.

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[guggero]

Thanks, LGTM 🎉

[yyforyongyu]

LGTM 🙏