Eliminate find_first_set and find_last_set from 9.5.6.4 p18 as reported by Matthias

Author: jaredhoberock

data_parallel_types.html

@@ -2826,7 +2826,7 @@ <h1><ins><code>simd_mask</code> reductions</ins></h1>
 
         <cxx-returns>
         <ins>
-          <code>all_of</code> and <code>any_of</code> return their arguments; <code>none_of</code> returns the negation of its argument; <code>some_of</code> returns <code>false</code>; <code>popcount</code> returns the integral representation of its argument; <code>find_first_set</code> and <code>find_last_set</code> return <code>0</code>.
+          <code>all_of</code> and <code>any_of</code> return their arguments; <code>none_of</code> returns the negation of its argument; <code>some_of</code> returns <code>false</code>; <code>popcount</code> returns the integral representation of its argument.
         </ins>
         </cxx-returns>