Fix lint error.

Author: Yhg1s

peps/pep-0810.rst

@@ -417,7 +417,7 @@ referenced the module. It **only** resolves the lazy object being accessed.
 Accessing a lazy object (from a global variable or a module attribute) reifies
 the object. Accessing a module's ``__dict__`` reifies **all** lazy objects in
 that module. Operations that indirectly access ``__dict__`` (such as
-:func`dir`) also trigger this behavior.
+:func:`dir`) also trigger this behavior.
 
 Example using ``__dict__`` from external code: