changes to choice xml doc

src/fsharp/FSharp.Core/control.fsi

@@ -269,18 +269,18 @@ namespace Microsoft.FSharp.Control
         static member Parallel : computations:seq<Async<'T>> -> Async<'T[]>
 
         /// <summary>Creates an asynchronous computation that executes all given asynchronous computations in parallel, 
-        /// returning the result of the first succeeding computation (i.e. the first computation with a result that is 'Some x').</summary>
+        /// returning the result of the first succeeding computation (one whose result is 'Some x').
+        /// If all child computations complete with None, the parent computation also returns None.</summary>
         ///
-        /// <remarks>If all child computations complete with None, the parent computation also returns None.
-        /// 
+        /// <remarks>
         /// If any child computation raises an exception, then the overall computation will trigger an 
         /// exception, and cancel the others. 
         ///
         /// The overall computation will respond to cancellation while executing the child computations.
         /// If cancelled, the computation will cancel any remaining child computations but will still wait
         /// for the other child computations to complete.</remarks>
         /// <param name="computations">A sequence of computations to be parallelized.</param>
-        /// <returns>A computation that returns the first of the input computations to succeed.</returns>
+        /// <returns>A computation that returns the first succeeding computation.</returns>
         static member Choice : computations:seq<Async<'T option>> -> Async<'T option>
 
         //---------- Thread Control