docs: release-notes-0.21

[MPins]

Release notes warning the users that the deprecated fee rate option --sat_per_byte will be removed in release version 0.22

[gemini-code-assist]

Summary of Changes

Hello @MPins, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the release notes for version 0.21.0 to proactively inform users about the upcoming removal of the --sat_per_byte fee rate option in the subsequent major release, version 0.22. The update details which RPC commands will be affected, ensuring users are well-prepared for the change.

Highlights

• Deprecation Warning Added: A new warning has been added to the release notes for version 0.21.0.
• Fee Rate Option Removal: The warning explicitly states that the deprecated --sat_per_byte fee rate option will be removed in release version 0.22.
• Impacted RPCs Listed: The release notes now list the specific RPCs that will be impacted by this removal, including sendcoins, sendmany, openchannel, closechannel, closeallchannels, and wallet bumpfee.

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[gemini-code-assist]

Code Review

This pull request adds a deprecation warning to the release notes for v0.21.0 regarding the removal of the --sat_per_byte option in v0.22. The change is correct in substance, but I have a suggestion to improve the wording for clarity.

[yyforyongyu]

Thanks!

[ziggie1984]

LGTM