Demote warnings to notices where appropriate, following the goal that as few "red box" warnings
should clutter the docs as possible.  Part 1: stuff that gets merged to Py3k.
diff --git a/Doc/library/codeop.rst b/Doc/library/codeop.rst
index 39981ca..674c51f 100644
--- a/Doc/library/codeop.rst
+++ b/Doc/library/codeop.rst
@@ -42,7 +42,7 @@
    (``'single'``, the default) or as an :term:`expression` (``'eval'``).  Any
    other value will cause :exc:`ValueError` to  be raised.
 
-   .. warning::
+   .. note::
 
       It is possible (but not likely) that the parser stops parsing with a
       successful outcome before reaching the end of the source; in this case,