Create section git restore

[HonkingGoose]

• I provide my work under the project license.
• I grant such license of my work as is required for the purposes of future print editions to Ben Straub and Scott Chacon.

Changes

• Create section on git restore

Context

Fixes #1487 as we now have a section explaining what git restore is.
Read #1487 for the discussion we had leading up to this pull request.

This issue is also related: #1441 but I'm not closing it with this pull, because that issue also talks about the git switch command, which this pull request does not add.

This is a rough draft, that basically copies the two undo sections that used git reset and replaced the examples with git restore.

I'm of course open to your feedback to improve the text. You always have great suggestions! 😄 👍

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Some questions/thoughts:

Should we perhaps change the example a bit more, so that we have less of a deja-vu experience? Or would that confuse readers even more?

I feel what I have now is quite heavy, and duplicates a lot of stuff.

And maybe rewrite this sentence, I really don't like this, it's a bit too complicated to understand at first read:

The nice part is that the command you use to determine the state of those two areas also reminds you how to undo changes to them.

It's a lot of words to basically say: git status is your friend and gives you helpful advice on how to undo stuff. 😸

[HonkingGoose]

Hi @ben, this is ready for review. It's still a draft, and too rough to merge yet. I'll mark it ready for review after fixing it with your feedback. 😄 😉

[ben]

Yeah, this looks great!

[HonkingGoose]

Changes:

• Squash already approved changes into one commit and rebase on top of current master.
• Add warning about git restore --staged <file> throwing away your local work.

[ben]

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