Corrections of sentence

doc/ref.html

@@ -242,7 +242,7 @@ The following blend mode values are available :</li>
 <h2>H2D Font</h2>
 
 <p>
-    To started with text manipulation we must to know the <code>h2d.Font</code> class.
+    To start with text manipulation, we must know the <code>h2d.Font</code> class.
 </p>
 
 <p>