chore: update template

Author: crazywoola

.github/ISSUE_TEMPLATE/docs.yml

@@ -64,5 +64,5 @@ body:
       label: Code of Conduct
       description: By submitting this issue, you agree to follow our contribution guidelines
       options:
-        - label: I agree to follow Dify's documentation contribution guidelines
+        - label: I agree to follow Dify's documentation [contribution guidelines](https://github.com/langgenius/dify/blob/0277a37fcad5ad86aeb239485c27fffd5cd90043/CONTRIBUTING.md)
           required: true