[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

src/attr/_make.py

@@ -919,7 +919,11 @@ def _create_slots_class(self):
                 annotation = inspect.signature(func).return_annotation
                 doclines = [f".. :type: {annotation}"]
                 if func.__doc__ is not None:
-                    doclines.extend(textwrap.indent(textwrap.dedent(func.__doc__), "    ").splitlines())
+                    doclines.extend(
+                        textwrap.indent(
+                            textwrap.dedent(func.__doc__), "    "
+                        ).splitlines()
+                    )
                 names[name] = "\n".join(doclines)
                 # Clear out function from class to avoid clashing.
                 del cd[name]