Applied Ted's suggestion

Co-authored-by: Ted Thibodeau Jr <tthibodeau@openlinksw.com>

index.html

@@ -2169,7 +2169,7 @@ <h3>Retrieve Verification Method</h3>
 <a href="#INVALID_VERIFICATION_METHOD">INVALID_VERIFICATION_METHOD</a>.
           </li>
           <li>
-If the [=verification method=] is not associated with the
+If the [=verification method=] is not associated with a
 [=verification relationship=] array in the <var>controllerDocument</var>,
 either by reference (URL) or by value (object), an error MUST be raised and
 SHOULD convey an error type of