Update rules.md : section on process of moderation

[martinjuckes]

Updates to guidance notes on the process of moderation as discussed in cf-convention/cf-conventions#151

[dblodgett-usgs]

These changes look great. I'll merge in three weeks unless we get more conversation.

[Copilot]

Pull Request Overview

This PR updates the moderation process guidelines in the CF Conventions rules document based on discussions from issue #151. The changes clarify the role and responsibilities of discussion moderators in the CF Conventions change process.

• Refined the proposal initiation language to specify using the "proposal-change-request template"
• Replaced general moderation guidance with a structured 5-point list defining specific moderator responsibilities
• Added clearer expectations for participant compliance with moderator requests

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