python: Strip leading and trailing spaces from docstrings.

This is enforced by Black ≥ 21.4b0.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

zerver/openapi/markdown_extension.py

@@ -337,7 +337,7 @@ def render_curl_example(
     exclude: Optional[List[str]] = None,
     include: Optional[List[str]] = None,
 ) -> List[str]:
-    """ A simple wrapper around generate_curl_example. """
+    """A simple wrapper around generate_curl_example."""
     parts = function.split(":")
     endpoint = parts[0]
     method = parts[1]