Add triggers to suggest-code-experts examples

[vim-zz]

trafficstars

✨ PR Description

Purpose and impact: This PR updates the "Explain Code Experts" automation to trigger on specific events and only for PRs with a 'suggest-reviewer' label.

Main changes:

• Added explicit triggers for PR creation, ready for review, and new commits
• Changed condition to only run on PRs with 'suggest-reviewer' label
• Updated documentation to reflect new trigger conditions and label requirement

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[gitstream-cm[bot]]

Please mark which AI tools you used for this PR by checking the appropriate boxes:

• [ ] GitHub Copilot
• [ ] Cursor
• [ ] ChatGPT
• [ ] Tabnine
• [ ] JetBrains AI Assistant
• [ ] VSCode IntelliCode
• [ ] Claude
• [ ] Gemini
• [ ] Other AI tool
• [ ] No AI tools were used

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[gitstream-cm[bot]]

A screenshot of the relevant part of docs after the changes is a life saver 🛟