gh-81548: Clarify the deprecation of octal sequences affect byte strings

Author: pablogsal

Doc/whatsnew/3.11.rst

@@ -1100,8 +1100,8 @@ Deprecated
   that was added in Python 3.10.
   (Contributed by Raymond Hettinger in :gh:`89519`.)
 
-* Octal escapes with value larger than ``0o377`` now produce
-  a :exc:`DeprecationWarning`.
+* Octal escapes in :class:`bytes` objects with value larger than ``0o377`` now
+  produce a :exc:`DeprecationWarning`.
   In a future Python version they will be a :exc:`SyntaxWarning` and
   eventually a :exc:`SyntaxError`.
   (Contributed by Serhiy Storchaka in :gh:`81548`.)