Update C-git-commands.asc with a new TextEdit command

[pibion]

• 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

• Update C-git-commands.asc with a new TextEdit command

Context

The existing git config instructions for TextEdit on Mac would hang after closing the TextEdit program. The instructions outlined in https://ericasadun.com/2018/07/12/using-textedit-as-your-git-editor/ worked and I propose updating the book with her solution.

[ben]

Three things:

1. The -W flag is short for --wait-apps, and -n is short for --new. When we're writing something that will go into a file and be forgotten until we're trying to figure out why it broke, we want to optimize for readability, so I'd prefer we keep the long version of the flags here.
2. The -e flag specifies that the file should be opened in TextEdit. Without it, you'll get whatever app registers itself as the default app for plain text files. We're specifically trying to get TextEdit here, so removing the -e flag just makes this less specific.
3. I just tested both variations of this, and they behave the same? You have to actually command-Q the app to make open recognize that it's done, but otherwise I don't see a difference.

[pibion]

Keeping the long version of the flags makes sense.

I'm not sure why we saw a different behavior on our system between these two commands, and I'll see if we can re-test to confirm that we weren't imagining things.