Fix typo in lint issue template (#15427)

Small typo I found while looking at recent lint requests/issues.

changelog: none

Author: samueltardieu

.github/ISSUE_TEMPLATE/new_lint.yml

@@ -51,7 +51,7 @@ body:
   - type: textarea
     id: comparison
     attributes:
-      label: Comparision with existing lints
+      label: Comparison with existing lints
       description: |
         What makes this lint different from any existing lints that are similar, and how are those differences useful?