improve comment

--HG--
branch : trunk

py/_code/_assertionnew.py

@@ -1,6 +1,6 @@
 """
-Like _assertion.py but using builtin AST.  It should replace _assertionold.py
-eventually.
+Find intermediate evalutation results in assert statements through builtin AST.
+This should replace _assertionold.py eventually.
 """
 
 import sys