Typo.

NEWS.txt

@@ -37,7 +37,7 @@ BTrees
   intended use is to help construct search indices, where, e.g.,
   integer word or document identifiers map to scores of some
   kind.  This is easier than trying to work with scaled integer
-  score in an ``IIBTree``, and Zope3 has moved to ``IFBTrees``
+  scores in an ``IIBTree``, and Zope3 has moved to ``IFBTrees``
   for these purposes in its search code.
 
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