Editorial: In CharacterSetMatcher, the Matcher must capture _A_ (#3102

, #3113)

... to be able to refer to it at step 2.l

spec.html

@@ -36482,7 +36482,7 @@ <h1>
             1. If _rer_.[[UnicodeSets]] is *true*, then
               1. Assert: _invert_ is *false*.
               1. Assert: Every element of _A_ consists of a single character.
-            1. Return a new Matcher with parameters (_x_, _c_) that captures _rer_, _invert_, and _direction_ and performs the following steps when called:
+            1. Return a new Matcher with parameters (_x_, _c_) that captures _rer_, _A_, _invert_, and _direction_ and performs the following steps when called:
               1. Assert: _x_ is a MatchState.
               1. Assert: _c_ is a MatcherContinuation.
               1. Let _Input_ be _x_'s _input_.