replace phrasing with parsing

Author: bachue

index.html

@@ -202,7 +202,7 @@ <h3>Ripper.tokenize &amp; Ripper.lex</h3>
 
 				<section>
 					<section>
-						<h1>Phasing</h1>
+						<h1>Parsing</h1>
 						<h2>LALR, Bison</h2>
                         <aside class="notes">
                             MRI uses GNU Bison to generate the parser code, from <code>parse.y</code> to <code>parse.c</code>