update doc

docs/sphinx_extensions/paramref_extension.py

@@ -1,11 +1,12 @@
 from docutils import nodes
 from docutils.parsers.rst.roles import register_local_role
 
+
 def paramref_role(name, rawtext, text, lineno, inliner, options={}, content=[]):
     # Simply replace :paramref: with :param:
     new_role = nodes.literal(text=text[1:])
     return [new_role], []
 
-def setup(app):
-    register_local_role('paramref', paramref_role)
 
+def setup(app):
+    register_local_role("paramref", paramref_role)