Fix workflow file

Author: rawilk

.github/workflows/markdown-normalize.yml

@@ -15,11 +15,8 @@ jobs:
         steps:
             -   name: Git checkout
                 uses: actions/checkout@v4
-                with:
-                    ref: ${{ github.head_ref }}
 
             -   name: Prettify markdown
                 uses: creyD/prettier_action@v4.3
                 with:
                     prettier_options: --write **/*.md
-                    commit_message: "Formatted markdown"