fix one typo and two pycodestyle suggestions

docs/extensiondev.rst

@@ -184,7 +184,7 @@ context is active when a request context is, or when a CLI command is
 run. If you're storing something that should be closed, use
 :meth:`~flask.Flask.teardown_appcontext` to ensure that it gets closed
 when the application context ends. If it should only be valid during a
-request, or would not be used in the CLI outside a reqeust, use
+request, or would not be used in the CLI outside a request, use
 :meth:`~flask.Flask.teardown_request`.
 
 

src/flask/cli.py

@@ -648,7 +648,7 @@ def _path_is_ancestor(path, other):
     """Take ``other`` and remove the length of ``path`` from it. Then join it
     to ``path``. If it is the original value, ``path`` is an ancestor of
     ``other``."""
-    return os.path.join(path, other[len(path) :].lstrip(os.sep)) == other
+    return os.path.join(path, other[len(path):].lstrip(os.sep)) == other
 
 
 def load_dotenv(path: str | os.PathLike | None = None) -> bool:

src/flask/config.py

@@ -325,7 +325,7 @@ class Config(dict):
             if not k.startswith(namespace):
                 continue
             if trim_namespace:
-                key = k[len(namespace) :]
+                key = k[len(namespace):]
             else:
                 key = k
             if lowercase: