Reformat all code to use shell instead of sh

snippets/delete-submodule.md

@@ -9,13 +9,13 @@ Deletes a submodule from the repository.
 - Use `rm -rf .git/modules/<submodule>` to remove the directory of the submodule.
 - Use `git rm -f <submodule>` to remove the working tree of the submodule.
 
-```sh
+```shell
 git submodule deinit -f -- <submodule>
 rm -rf .git/modules/<submodule>
 git rm -f <submodule>
 ```
 
-```sh
+```shell
 git submodule deinit -f -- 30code
 rm -rf .git/modules/30code
 git rm -f 30code