Fix typo

Co-authored-by: Barry Warsaw <[email protected]>

Author: encukou

peps/pep-0011.rst

@@ -166,7 +166,7 @@ general improvements, may be rejected or removed from the code base
 without a deprecation process.
 Core team members that do this intentionally are encouraged to notify people
 listed in the `Platforms experts list`_ in the CPython contributor's guide,
-to review any submitted fixes (if inobtrusive), and to consider adding
+to review any submitted fixes (if unobtrusive), and to consider adding
 configuration or extension capabilities necessary for workarounds.
 
 People interested in unsupported platforms may add themselves to the