Reformat all code to use shell instead of sh

snippets/change-remote-url.md

@@ -7,11 +7,11 @@ Changes the URL of the remote repository.
 
 - Use `git remote set-url origin <url>` to change the URL of the remote repository to `<url>`.
 
-```sh
+```shell
 git remote set-url origin <url>
 ```
 
-```sh
+```shell
 git remote set-url origin https://github.com/30-seconds/30-seconds-of-code
 # The remote URL is now "https://github.com/30-seconds/30-seconds-of-code"
 ```