Reformat all code to use shell instead of sh

snippets/clone-repo.md

@@ -8,11 +8,11 @@ Clones an existing repository, creating a local copy of it.
 - Use `git clone <url>` to clone an existing repository from `<url>` to a local directory. The directory's name will be based on the name of the cloned repository.
 - Alternatively, use `git clone <url> [<directory>]` to clone the repository into the specified local `<directory>`.
 
-```sh
+```shell
 git clone <url> [<directory>]
 ```
 
-```sh
+```shell
 git clone https://github.com/30-seconds/30-seconds-of-code.git
 # Clones the repository in a new directory named '30-seconds-of-code'
 cd 30-seconds-of-code