Properly document multiprocessing's logging support, resolve outstanding issues with the custom levels
diff --git a/Misc/NEWS b/Misc/NEWS
index 0b5f801..4fc5d5e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -145,6 +145,10 @@
 Library
 -------
 
+- Fix and properly document the multiprocessing module's logging
+  support, expose the internal levels and provide proper usage
+  examples.
+
 - Issue #1672332: fix unpickling of subnormal floats, which was
   producing a ValueError on some platforms.