Reformat all code to use shell instead of sh

snippets/delete-remote-branch.md

@@ -7,11 +7,11 @@ Deletes a remote branch.
 
 - Use `git push -d <remote> <branch>` to delete the specified remote `<branch>` on the given `<remote>`.
 
-```sh
+```shell
 git push -d <remote> <branch>
 ```
 
-```sh
+```shell
 git checkout master
 git push -d origin patch-1 # Deletes the `patch-1` remote branch
 ```