remove the deprecation warnings for the old threading API; update the docs

Reviewer: Benjamin Peterson
diff --git a/Misc/NEWS b/Misc/NEWS
index 2f1f58a..5947aeb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -60,6 +60,8 @@
 Library
 -------
 
+- The deprecation warnings for the camelCase threading API names were removed.
+
 Extension Modules
 -----------------