chore(repo): fix excess newline in placeholder (#6778)

<img width="882" alt="image" src="https://github.com/winglang/wing/assets/598796/1a0cfe10-6069-48c1-8363-05546f32b8f3">



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.github/ISSUE_TEMPLATE/feature.yml

@@ -16,9 +16,7 @@ body:
   id: use-cases
   attributes:
     label: Use Case
-    placeholder: |
-      What problem are you trying to solve? Describe a *concrete* example of something you are trying to do and as many details as possible
-      about your motivation, the environment, etc.
+    placeholder: What problem are you trying to solve? Describe a *concrete* example of something you are trying to do and as many details as possible about your motivation, the environment, etc.
   validations:
     required: true