[Docs]: document that users should avoid styling FluentProvider.

[spmonahan]

Library

React Components / v9 (@fluentui/react-components)

Describe the feature that you would like added

Users should probably avoid applying styles directly to FluentProvider as doing so can cause rendering bugs.

See: #30040

Have you discussed this feature with our team

@spmonahan

Additional context

Multiple users have experienced this (including yours truly) and some feedback is that having documentation would be helpful.

Validations

• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Priority

Low

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Because this issue has not had activity for over 150 days, we're automatically closing it for house-keeping purposes.

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