Fixed misspelling.

Misc/NEWS

@@ -183,7 +183,7 @@ Core language, builtins, and interpreter
   complex numbers except for equality, I hope that this doesn't break
   too much code.
 
-- The outcome of comparing non-numeric objects of differerent types is
+- The outcome of comparing non-numeric objects of different types is
   not defined by the language, other than that it's arbitrary but
   consistent (see the Reference Manual).  An implementation detail changed
   in 2.1a1 such that None now compares less than any other object.  Code