Use standardized step names in "Spell Check" workflow

These are the naming conventions established in the standardized template workflow.

Author: per1234

.github/workflows/spell-check-task.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
+      - name: Checkout repository
         uses: actions/checkout@v2
 
       - name: Install Python
@@ -26,7 +26,7 @@ jobs:
       - name: Install Poetry
         run: pip install poetry
 
-      - name: Install Taskfile
+      - name: Install Task
         uses: arduino/setup-task@v1
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}