Settings: unclear hard-coded keyboard shortcut description to opacity in Always on Top

### Microsoft PowerToys version

0.98

### Installation method

Dev build in Visual Studio

### Area(s) with issue?

Always on Top, Settings

### Steps to reproduce

To be honest, it took me a moment to realize that the description is not talking about the numpad + and numpad - keys.

### ✔️ Expected Behavior

_No response_

### ❌ Actual Behavior

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### Upload Bug Report ZIP-file

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### Additional Information

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### Other Software

_No response_

Start in the Always on Top settings UI and inspect the hard-coded description for the opacity keyboard shortcut. Clarify the wording so it cannot be mistaken for numpad plus and minus keys; the issue is complete when the shortcut description is unambiguous.

Written by the indexing model from the issue text.