Actually fix flake8 lint

Author: FeldrinH

lib/matplotlib/pyplot.py

@@ -554,9 +554,9 @@ def isinteractive() -> bool:
     return matplotlib.is_interactive()
 
 
-# Note: The return type of ioff being AbstractContextManager 
+# Note: The return type of ioff being AbstractContextManager
 # instead of ExitStack is deliberate.
-# See https://github.com/matplotlib/matplotlib/issues/27659 
+# See https://github.com/matplotlib/matplotlib/issues/27659
 # and https://github.com/matplotlib/matplotlib/pull/27667 for more info.
 def ioff() -> AbstractContextManager:
     """
@@ -598,9 +598,9 @@ def ioff() -> AbstractContextManager:
     return stack
 
 
-# Note: The return type of ion being AbstractContextManager 
+# Note: The return type of ion being AbstractContextManager
 # instead of ExitStack is deliberate.
-# See https://github.com/matplotlib/matplotlib/issues/27659 
+# See https://github.com/matplotlib/matplotlib/issues/27659
 # and https://github.com/matplotlib/matplotlib/pull/27667 for more info.
 def ion() -> AbstractContextManager:
     """