docs: added a page for editing messages from a button click

[Jaskowicz1]

This PR adds a page to show people how to edit messages from a button click (using stuff like dpp::ir_deferred_update_message, etc).

Documentation change checklist

• [x] My documentation changes follow the docs style guide and any code examples follow the coding style guide.
• [x] I tested that my change works before raising the PR (via running doxygen, and testing examples).
• [x] I have not moved any existing pages or changed any existing URLs without strong justification as to why.
• [x] I have not generated content using AI or a desktop utility such as grammarly.

[netlify[bot]]

✅ Deploy Preview for dpp-dev ready!

Name	Link
🔨 Latest commit	f640c3b00c9244d3f288409c49162c75d60aba91
🔍 Latest deploy log	https://app.netlify.com/sites/dpp-dev/deploys/66979fbf7ea28d00085dcb46
😎 Deploy Preview	https://deploy-preview-1163--dpp-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[Jaskowicz1]

Reverted to draft, didn't mean to publish as an open PR.