Reformat all code to use shell instead of sh

snippets/current-branch-name.md

@@ -7,11 +7,11 @@ Prints the current branch name.
 
 - Use `git rev-parse --abbrev-ref HEAD` to print the name of the current branch.
 
-```sh
+```shell
 git rev-parse --abbrev-ref HEAD
 ```
 
-```sh
+```shell
 git checkout patch-1
 git rev-parse --abbrev-ref HEAD # Prints `patch-1`
 ```