Docs: Update commit list documentation

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Problem to solve

Right now, these changes are behind the project_commits_refactor FF, marked as wip, and default_enabled: false. Do you know when this is planned to change? Just curious about future work for updating the Commits docs page.

@brendan777 tysm!! we got a bit way to go for this refactor. The main FE UI here (e.g. the actual list of commits) is actually based on mock data, since we're waiting for backend. i'm thinking we can open a placeholder issue for updating docs under &17482 and link it as part of the rollout [FF] - `project_commits_refactor` - Rollout the... (#545170).