remove py3k warnings about the threading api; update docs

Reviewer: Benjamin Peterson
diff --git a/Misc/NEWS b/Misc/NEWS
index 6f012ab..73bcf08 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -53,6 +53,8 @@
 Library
 -------
 
+- The deprecation warnings for the old camelCase threading API were removed.
+
 - logging: fixed lack of use of encoding attribute specified on a stream.
 
 - Silenced a trivial compiler warning in the sqlite module.