Reformat all code to use shell instead of sh

snippets/optimize-repository.md

@@ -7,10 +7,10 @@ Optimizes the local repository.
 
 - Use `git gc --prune=now --aggressive` to garbage collect loose objects.
 
-```sh
+```shell
 git gc --prune=now --aggressive
 ```
 
-```sh
+```shell
 git gc --prune=now --aggressive # Optimizes the local repository
 ```