Fixed formatting in workflow

Author: daymxn

.github/workflows/diff-javadoc.yml

@@ -13,7 +13,7 @@ jobs:
         run: mkdir ~/diff
 
       - name: Checkout PR branch
-      - uses: actions/checkout@v3
+        uses: actions/checkout@v3
         with:
           fetch-depth: 2
           submodules: true
@@ -32,7 +32,7 @@ jobs:
         run: mv build ~/diff/modified
 
       - name: Checkout master
-      - uses: actions/checkout@v3
+        uses: actions/checkout@v3
         with:
           ref: ${{ github.base_ref }}