Reformat all code to use shell instead of sh

snippets/branches-containing-commit.md

@@ -7,11 +7,11 @@ Prints all the branches containing a specific commit.
 
 - Use `git branch --contains <commit>` to see a list of all branches containing `<commit>`.
 
-```sh
+```shell
 git branch --contains <commit>
 ```
 
-```sh
+```shell
 git branch --contains 3050fc0d3
 # patch-1
 # patch-2