Change "valid" to "conforming" for controller and vm documents.

index.html

@@ -2153,7 +2153,7 @@ <h3>Retrieve Verification Method</h3>
 <a href="#INVALID_CONTROLLER_DOCUMENT_ID">INVALID_CONTROLLER_DOCUMENT_ID</a>.
           </li>
           <li>
-If <var>controllerDocument</var> is not a valid [=controller document=],
+If <var>controllerDocument</var> is not a [=conforming controller document=],
 an error MUST be raised and SHOULD
 convey an error type of
 <a href="#INVALID_CONTROLLER_DOCUMENT">INVALID_CONTROLLER_DOCUMENT</a>.
@@ -2164,7 +2164,7 @@ <h3>Retrieve Verification Method</h3>
 rules of the media type of the <var>controllerDocument</var>.
           </li>
           <li>
-If <var>verificationMethod</var> is not a valid [=verification method=],
+If <var>verificationMethod</var> is not a [=conforming verification method=],
 an error MUST be raised and SHOULD convey an error type of
 <a href="#INVALID_VERIFICATION_METHOD">INVALID_VERIFICATION_METHOD</a>.
           </li>