docs: Rename completion script to be hyphenated

Author: PurpleBooth

docs/binaries/mit-prepare-commit-msg.md

@@ -58,7 +58,7 @@ Options:
 ```
 
 You can generate completion with
-
+// AI! Rename this to be hyphenated
 ``` shell,script(name="generate_mit_prepare_commit_msg_completion",expected_exit_code=0)
 mit-prepare-commit-msg --completion bash
 ```