Reformat all code to use shell instead of sh

snippets/unstage-files.md

@@ -8,11 +8,11 @@ Removes files from the staging area.
 - Use `git restore --staged <pathspec>` to remove files from the staging area.
 - `<pathspec>` can be a filename or a fileglob.
 
-```sh
+```shell
 git restore --staged <pathspec>
 ```
 
-```sh
+```shell
 git restore --staged "30seconds.txt"
 # Remove the file `30seconds.txt` from the staging area