Update error_code_list2.rst

Author: wyattscarpenter

docs/source/error_code_list2.rst

@@ -682,7 +682,7 @@ Example:
 Error if an untyped decorator makes a typed function effectively untyped [untyped-decorator]
 ----------------------------------------------------->
 
-If enabled with :option:`--disallow-untyped-decorators`
+If enabled with :option:`--disallow-untyped-decorators <mypy --disallow-untyped-decorators>`
 mypy generates an error if a typed function is wrapped by an untyped decorator
 (as this would effectively remove the benefits of typing the function).