[ricsam]

What does this PR do?

Added a warning about known issues with HMR and CSS Modules in the docs.

How did you verify your code works?

Previewed the documentation updates

[coderabbitai]

Walkthrough

Added warning documentation about a known HMR bug for CSS Modules to the CSS bundler documentation. The warnings were inserted in two locations within the CSS Modules sections, clarifying that the issue occurs only during development with HMR enabled.

Changes

Cohort / File(s)	Change Summary
Documentation updates docs/bundler/css.mdx	Added warning blocks detailing a known HMR bug for CSS Modules (issue #18258) in two locations within the CSS Modules documentation, specifying that the issue occurs only in development with HMR enabled

Pre-merge checks

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding documentation about a known HMR issue with CSS Modules, which matches the file changes in docs/bundler/css.mdx.
Description check	✅ Passed	The pull request description follows the required template with both sections completed appropriately.

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[robobun]

A fix for the underlying bug is in review in #42058. Once it merges, import styles from "./x.module.css" works under the dev server with HMR, and this note would no longer be needed.