MDL-78806 better page title documentation

[junpataleta]

Dev docs for when MDL-78806 gets integrated

[netlify]

✅ Deploy Preview for moodledevdocs ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	0f91708
🔍 Latest deploy log	https://app.netlify.com/sites/moodledevdocs/deploys/6501d41a1ef95f0008f6838c
😎 Deploy Preview	https://deploy-preview-729--moodledevdocs.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.

[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 70	🟠 87	🟢 92	🟢 90	🟢 100	Report
/docs/apis/commonfiles	🔴 42	🟠 85	🟢 92	🟢 100	🟢 100	Report
/general/development/gettingstarted	🟠 56	🟠 87	🟢 92	🟢 90	🟢 100	Report
/general/releases	🔴 46	🟠 87	🟢 92	🟢 100	🟢 100	Report

[andrewnicols]

Approving but I think we need to be careful and re-assess the example:

// Activity name and its sub-page as the unique identifying information.
$pagename = format_string($cm->name) . ': ' . get_string('view');

This is a great example of lang string concatenation, which we should avoid where possible.