refactor: simplify flag naming tooltip

[thomasheartman]

This PR simplifies the flag naming tooltip considerably. It now only contains an example of a pattern and what it will match. It also updates the link in the form section description to point directly to a regex cheat sheet instead of a general regex reference document.

There's a few reasons for doing this:

1. The text preceding the input already explains what the pattern does and explains that it is a regex.
2. The text preceding the input also contains a link to a regex cheat sheet (which is arguably a better place to explain regexes than a tooltip).
3. The tooltip was very long. While a lot of the information there was useful, it would also be hard to use. Imagine a user checking the tooltip, scrolling all the way down, but accidentally moving the mouse a bit and the tooltip disappearing. They would have to scroll all the way down again. Or maybe they need to remember what it was they just looked at. It would be more useful to have the information on a separate page.
4. The tooltip is not accessible by keyboard. This means that users who use a keyboard to navigate the UI would not be able to scroll or otherwise navigate the tooltip, potentially leaving them in the dark.

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