Limit the involvement of Tim Berners Lee to the TAG proper

As the Council's purpose is to replace his former role as Director in
resolving Formal Objections, this removes him from being part of the
Council. This way, he does not take part in the Council's deliberations,
and is not on the critical path for Council votes or quorum questions,
notably the Council's Unanimous Short Circuit.

See #784

index.bs

@@ -2344,7 +2344,7 @@ Council Composition</h5>
 	Each [=W3C Council=] is composed of the following members (excepting any [[#council-participation|renounced or dismissed]]):
 	* the [=CEO=] or their chosen [=Team=] delegate
 	* the members of the [=Advisory Board=]
-	* the members of the [=Technical Architecture Group=]
+	* the members of the [=Technical Architecture Group=] other that Tim Berners Lee
 
 	Participation in a [=W3C Council=] <em class=rfc2119>must not</em> require attendance of [=face-to-face meetings=].