fix angle brackets

Author: gewarren

xml/System.Linq/ParallelEnumerable.xml

@@ -3951,7 +3951,7 @@
       <Docs>
         <typeparam name="TSource">The type of elements of <paramref name="source" />.</typeparam>
         <typeparam name="TKey">The type of the key returned by <paramref name="keySelector" />.</typeparam>
-        <param name="source">An OrderedParallelQuery\<TSource> that contains elements to sort.</param>
+        <param name="source">An OrderedParallelQuery&lt;TSource&gt; that contains elements to sort.</param>
         <param name="keySelector">A function to extract a key from an element.</param>
         <summary>Groups in parallel the elements of a sequence according to a specified key-selector function.</summary>
         <returns>A sequence of groups that are sorted in descending order according to <typeparamref name="TKey" />.</returns>