update important note for git restore & git reset HEAD

[BPylypenko]

• 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

• updated Important note at Git-Basics-Undoing-Things:

It’s important to understand that git checkout —  is a dangerous command. Any local changes you made to that file are gone — Git just replaced that file with the most recently-committed version. Don’t ever use this command unless you absolutely know that you don’t want those unsaved local changes.

It’s important to understand that git checkout —  is a dangerous command. Any local changes you made to that file are gone — Git just replaced that file with the last staged or committed version. Don’t ever use this command unless you absolutely know that you don’t want those unsaved local changes.

As it's more precise what's happening when you have staged file, then made changes to them and then reverted unstaged changes.

Context

Fixes #1602

[Morganov]

Looks good to me.

[ben]

Yes, that's definitely better. Thanks!