Separate the existing "advance notice" from the start of chartering

Part of dealing with w3c#580

index.bs

@@ -1702,17 +1702,19 @@ Lifecycle of Chartered Groups</h2>
 	<dfn>charter drafts</dfn> go through a public [=charter refinement=] phase
 	during which the [=charter=] receives [=wide review=]
 	and the [=Chartering Facilitator=] attempts to find [=consensus=] on the charter.
+	[The [=Team=] <em class=rfc2119>may</em> send notice to the [=AC=]
+	when starting development of a new charter prior to the [=charter refinement=] phase.
 
 <h3 id="charter-initiation">
 Initiating Charter Refinement</h3>
 
-	[=Charter refinement=] (see below) is initiated
-	by the [=Team=] sending an [=charter/Advance Review Notice=]
+	Formal [=charter refinement=] (see below) is initiated
+	by the [=Team=] sending an [=charter review notice=]
 	to the [=Advisory Committee=],
 	to the public,
 	and, in the case of rechartering, to the affected [=Group=].
 
-	This <dfn for=charter>Advance Review Notice</dfn> must indicate:
+	This <dfn>charter review notice</dfn> must indicate:
 	* A short summary of the proposal.
 	* The location of the [=charter draft=], which must be public.
 	* How to participate in the discussion of this [=charter draft=] and where to file issues.