Tabs: Improve PHP docs

[Soean]

What?

1. Removes PHPDoc for non-existing parameter.
2. Fixes a typo

[github-actions]

Flaky tests detected in 1e5ee77.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/18940475309
📝 Reported issues:

• [Flaky Test] Navigation text does not inherit the link color from the theme/group #69177 in /test/e2e/specs/editor/blocks/navigation-colors.spec.js

[github-actions]

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Co-authored-by: Soean <soean@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

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