git-clean: rework and expand page

[waldyrious]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
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• Version of the command being documented (if known):

Reference issue: #

[Managor]

Suggested change

	- Immediately force deletion of all untracked files:
	- Delete all untracked files without prompting:

I felt like the wording was off.

[waldyrious]

I think that may be misleading: the -f option does not control prompting (the -i does); instead, it's a way to confirm your decision to go ahead with an irreversible change — similar to how you need to pass -f to rm a directory, regardless of whether you use -i or not.

Besides, I think it's important to keep the "force" word in the description, to help readers create the mental association with the -f option name.

(That said, I certainly agree that this command has an awkward UX, and would welcome alternative suggestions that might make the wording feel less off, as long as they don't conflict with the above points).