Bruno Leroux 0e11196c03
Update some BottomNavigationBar comments to reflect theme normalization (#179404)
## Description

This PR updates [BottomNavigationBar.selectedItemColor] and
[BottomNavigationBar.unselectedItemColor] documentation to reflect the
changes related to theme normalization.
It also fixes the [BottomNavigationBar.selectedItemColor] documentation
to mention the correct default values.

## Related Issue

Related to https://github.com/flutter/flutter/issues/91772

## Tests

- Documentation only
2025-12-04 08:03:24 +00:00
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