Update decimal docs for the new floating point repr().

Doc/library/decimal.rst

@@ -30,9 +30,9 @@ arithmetic.  It offers several advantages over the :class:`float` datatype:
   people learn at school." -- excerpt from the decimal arithmetic specification.
 
 * Decimal numbers can be represented exactly.  In contrast, numbers like
-  :const:`1.1` do not have an exact representation in binary floating point. End
-  users typically would not expect :const:`1.1` to display as
-  :const:`1.1000000000000001` as it does with binary floating point.
+  :const:`1.1` and :const:`2.2` do not have an exact representations in binary
+  floating point. End users typically would not expect ``1.1 + 2.2`` to display
+  as :const:`3.3000000000000003` as it does with binary floating point.
 
 * The exactness carries over into arithmetic.  In decimal floating point, ``0.1
   + 0.1 + 0.1 - 0.3`` is exactly equal to zero.  In binary floating point, the result