Docs: Improve filter hook docblock in WP_Navigation_Fallback

[GeorgeWebDevCy]

Removes the redundant phrase "whether or not" from the wp_navigation_should_create_fallback filter hook docblock for improved clarity.

Changes

• Simplifies the filter hook description to follow WordPress documentation standards.

Testing

• Verified no functional changes.
• Confirmed line is within non-hot-path code.

Props orionaselite.

[github-actions]

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Props orionaselite, apermo.

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[github-actions]

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[apermo]

LGTM

[apermo]

Maybe worth checking if there are other phpdoc fixes available in the same file.