Add missing template parameter as reported by Bryce

Author: jaredhoberock

algorithms.html

@@ -148,7 +148,7 @@ <h1>Header <code>&lt;experimental/algorithm&gt;</code> synopsis</h1>
 <cxx-ref insynopsis="" to="parallel.alg.inductions"></cxx-ref> Support for inductions
 template&lt;class T&gt;
   <em>unspecified</em> induction(T&amp;&amp; var);
-template&lt;class T&gt;
+template&lt;class T<ins>, class S</ins>&gt;
   <em>unspecified</em> induction(T&amp;&amp; var, S stride);
 
 <cxx-ref insynopsis="" to="parallel.alg.forloop"></cxx-ref> for_loop