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### What?
This PR updates the documentation to clarify the interaction between
`loading.js` and `layout.js`.

### Why?
To address a common point of confusion and potential blocking navigation
issues when layouts are dynamic. It provides clear guidance on how
`loading.js` behaves relative to layouts and how to use `<Suspense>` for
dynamic layout parts.

### How?
- Added a "Good to know" callout in `loading.mdx` explaining that
`loading.js` does not wrap the layout.
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in `layout.mdx`, including an explanation and a code example for
wrapping dynamic layout components with `<Suspense>`.
- Added a brief "Good to know" callout in `fetching-data.mdx` for
consistency.

Closes NEXT-
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---
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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Joseph Chamochumbi <joseph.chamochumbi@vercel.com>
Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>