Change description of rebase and cherry-pick

[snan]

Both of them do copy, it's just that rebase also moves the branch head
making the previous commits slightly less accessible. Also it's git
cherry-pick with a hyphen.

[snan]

Here's how this started (in case this explanation makes this PR less creepy):

1. I stumbled over this page after searching for info on how to set up netrc as a credential's helper
2. I wanted to tell you that rebase does copy but you didn't have an email under /contact, only links to sites I don't wanna register on (like LinkedIn and MySpace)
3. I thought I'd do the old "clone someone's repo and look in the git log" polite way to find out someone's email address, but you had the email listing set to off in GitHub settings
4. I thought waiddaminute, there's a repo of the entire site
5. I was reminded of why RST sucks 💁🏻‍♀️

Take it or leave it, thanks for a great git resource, I had never heard of your web page before.

[snan]

I left the commits as separate rather than squashed in case you wanna skip some of them 🤷🏻‍♀️

[grahamlopez]

Hi! Thanks so much for taking the time to leave me feedback.

I actually keep the sources for this website in a private repo and only keep the generated result in this public one. So I have made most of the changes you suggested over there and updated the site.

I am keeping the description of git rebase as it is for now, because I think for a mental model it is fine to think of the commits as being moved instead of copied insofar as you can't easily reach the before-rebase commits through normal beginner level git workflows (e.g. without using the reflog). And if/when cleared from the reflog, I believe they eventually get collected by the garbage collector.

[snan]

Reflog isn't beginner level…?! There's another issue with the idea of moving the commits; copying makes it less weird that the new hashes aren't the same. IDK, I just had a hard time understanding git until I learned what was really going on. So when people express mental models like this, beginners will go "whaddayamean moved…?"

[grahamlopez]

That's also a fair point. I'll keep thinking about it. Considering them as copied also seems confusing to me, as they aren't readily accessible with their pre-rebase history (as with e.g. cherry-pick). IDK, like I said, you've given me something to think about.