Update index.html

Fix a logical prose error (swapped 'recognizer' and 'parser')

Author: direvus

index.html

@@ -206,7 +206,7 @@ <h3><a name="algorithm">The Algorithm</a></h3>
 
 <h2><a name="parser">The Parser</a></h2>
 
-<p>To extend the parser to a recognizer, we add a shared packed parse
+<p>To extend the recognizer to a parser, we add a shared packed parse
 forest (SPPF) node to each Earley item, as described in Elizabeth
 Scott's paper <a
 href="http://www.sciencedirect.com/science/article/pii/S1571066108001497">SPPF-style