Editorial rejuggling of the handling of special election

Move shared text around so that it is better shared,
and rephrase awkward sentence along the way.

Author: frivoal

index.bs

@@ -1372,7 +1372,7 @@ Elected Groups Vacated Seats</h5>
 		<li>
 			When an elected seat on either the [=AB=] or [=TAG=] is vacated,
 			the seat is filled at the next regularly scheduled election for the group
-			unless the group Chair requests that W3C hold an election before then
+			unless the group Chair requests that W3C hold a [=special election=] before then
 			(for instance, due to the group's workload).
 
 			<ul>
@@ -1386,22 +1386,19 @@ Elected Groups Vacated Seats</h5>
 					including a resignation effective as of a given date in the future.
 			</ul>
 
-			When such an election is held,
-			the minimum number of available seats is such that
-			when added to the number of continuing participants,
-			the minimum total number of elected seats is met
-			(8 for the [=TAG=], 9 for the [=AB=]);
-			and the maximum number corresponds to all unoccupied seats.
-			Except for the number of available seats and the length of the terms,
-			the <a href="#AB-TAG-elections">usual rules for Advisory Board and Technical Architecture Group Elections</a> apply.
-
 		<li>
 			If vacancies reduce the number of [=AB=] or [=TAG=] participants to 0,
-			the [=Team=] <em class=rfc2119>must</em> organize an election.
-			Vacated seats are filled for the remainder of the term of the vacancy,
+			the [=Team=] <em class=rfc2119>must</em> organize a [=special election=]
 			unless the next regularly scheduled election is fewer than three months away.
 	</ul>
 
+	When a <dfn>special election</dfn> is held,
+	vacated seats are filled for the remainder of the term of the vacancy,
+	and the (minimum, maximum) number of available seats is
+	the number of seats required to meet
+	the (minimum, maximum) total defined for the group.
+	The <a href="#AB-TAG-elections">usual rules for Advisory Board and Technical Architecture Group Elections</a> otherwise apply.
+
 <h3 id="GAGeneral" oldids="ChapterGroups, WG-and-IG">
 Chartered Groups: Working Groups and Interest Groups</h3>