Eliminate note about reduce as reported by Marshall & Matthias

Author: jaredhoberock

data_parallel_types.html

@@ -1789,14 +1789,6 @@ <h1><ins><code>simd</code> reductions</ins></h1>
           Any exception thrown from <code>binary_op</code>.
         </ins>
         </cxx-throws>
-
-        <p>
-        <cxx-note>
-        <ins>
-          This overload of <code>reduce</code> does not require an initial value because <code>x</code> is guaranteed to be non-empty.
-        </ins>
-        </cxx-note>
-        </p>
       </cxx-function>
 
       <cxx-function>