Fix docstring.

Author: domdfcoding

flake8_missing_annotations/__init__.py

@@ -204,7 +204,7 @@ def visit_FunctionDef(self, function: ast.FunctionDef) -> None:
 		"""
 		Visit ``def foo(): ...``.
 
-		:param node: The node being visited.
+		:param function: The node being visited.
 		"""
 
 		args: ast.arguments = function.args