Feedback Unity Hub shows "Beta program webpage" when there are only "Alpha" versions to install

A minor inaccuracy, but one nonetheless. To reproduce, go to:

1. Unity Hub (3.1.2).
2. Installs.
3. Install Editor.
4. Pre-releases.
5. Click on "Beta program webpage".

- Expected Result: You are redirected to Beta page.
- Actual Result: You are redirected to Alpha page.

> This error occurs when there are Only Alpha releases to install.

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- A quick solution to avoid the confusion, would be to write: Alpha/Beta program webpage

Like this:

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