Humanoid.yaml: Remove "Unequip" sentence in :EquipTool description.

[TheWandererLee]

The sentence regarding unequipping tool does not apply to :EquipTool(). It applies to :UnequipTool()

Changes

Remove the incorrectly placed sentence.

Checks

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[github-actions]

Hi @TheWandererLee, thanks so much for helping improve the Roblox creator documentation! Our technical writing team will review your pull request soon. In the meantime, please ensure you've read through the README.md, contribution guidelines, and style recommendations.