Simplify warning message in Navigation block settings.

[towfeeqkhan]

This pull request addresses a minor issue in the submenu warning text to enhance its readability and clarity. Fixes #68181

[github-actions]

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Unlinked contributors: towfeeqkhan, AvulaRamSwaroop.

Co-authored-by: Mamaduka <[email protected]>
Co-authored-by: getdave <[email protected]>

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[github-actions]

👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @towfeeqkhan! In case you missed it, we'd love to have you join us in our Slack community.

If you want to learn more about WordPress development in general, check out the Core Handbook full of helpful information.

[Mamaduka]

Thanks for contributing, @towfeeqkhan!

The PR contains a lot of unnecessary changes and fails Static Analysis checks. Please check the code contribution guidelines for how to fix them: https://developer.wordpress.org/block-editor/contributors/code/getting-started-with-code-contribution/#developer-tools.