Enhance check_user_can_edit method with detailed docstring for clarity

atlas/models.py

@@ -549,7 +549,15 @@ class Case(models.Model, AuthorMixin, QuestionMixin):
 
         return size
 
-    def check_user_can_edit(self, user):
+    def check_user_can_edit(self, user) -> bool:
+        """Check if the user can edit the case.
+
+        Args:
+            user (User): The user to check.
+
+        Returns:
+            bool: True if the user can edit the case, False otherwise.
+        """
         if user.is_superuser:
             return True