Use clearer variable name

Author: chriswblake

.github/workflows/start-exercise.yml

@@ -117,7 +117,7 @@ jobs:
           template-vars: |
             title=${{ inputs.exercise-title }}
             login=${{ github.actor }}
-            link_to_exercise=${{ needs.create_exercise.outputs.issue-url }}
+            issue_url=${{ needs.create_exercise.outputs.issue-url }}
 
       - name: Overwrite README
         env:

markdown-templates/readme/exercise-started.md

@@ -8,7 +8,7 @@ This is your personal copy of the **{{ title }}** exercise.
 
 **Ready to get started?**
 
-[![](https://img.shields.io/badge/Go%20to%20Exercise-%E2%86%92-brightgreen?style=for-the-badge&logo=github)]({{{ link_to_exercise }}})
+[![](https://img.shields.io/badge/Go%20to%20Exercise-%E2%86%92-brightgreen?style=for-the-badge&logo=github)]({{{ issue_url }}})
 
 _You can come back to the exercise at any point in time if you decide to do it in parts!_