Fix typo in hello-world.yml file

Author: notatechproblem

.github/workflows/hello-world.yml

@@ -6,4 +6,4 @@ jobs:
     steps:
       - name: check out repo
         uses: actions/checkout@v4
-      - run: echo "${cat hell_world.txt}"
+      - run: echo "${cat hello_world.txt}"