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/string.rst b/Doc/library/string.rst
index 6ca0873..d17ac7a 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -599,7 +599,7 @@
map each character in *from* into the character at the same position in *to*;
*from* and *to* must have the same length.
- .. warning::
+ .. note::
Don't use strings derived from :const:`lowercase` and :const:`uppercase` as
arguments; in some locales, these don't have the same length. For case