chore: update mkdir command docs

Author: adamhenson

packages/foo-api-docs/docs/lighthouse-check-github-action/examples.md

@@ -40,7 +40,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
-    - run: mkdir ${{ github.workspace }}/tmp/artifacts
+    - run: mkdir -p ${{ github.workspace }}/tmp/artifacts
     - name: Lighthouse
       uses: foo-software/lighthouse-check-action@master
       with:
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - run: mkdir ${{ github.workspace }}/tmp/artifacts
+      - run: mkdir -p ${{ github.workspace }}/tmp/artifacts
       - name: Run Lighthouse
         uses: foo-software/lighthouse-check-action@master
         with: