Editorial: Make an alias name more clear

spec.html

@@ -33997,9 +33997,9 @@ <h1>
                 1. Let _refReplacement_ be the substring of _str_ from min(_tailPos_, _stringLength_).
                 1. NOTE: _tailPos_ can exceed _stringLength_ only if this abstract operation was invoked by a call to the intrinsic @@replace method of %RegExp.prototype% on an object whose *"exec"* property is not the intrinsic %RegExp.prototype.exec%.
               1. Else if _templateRemainder_ starts with *"$"* followed by 1 or more decimal digits, then
-                1. If _templateRemainder_ starts with *"$"* followed by 2 or more decimal digits, let _d_ be 2. Otherwise, let _d_ be 1.
-                1. Let _ref_ be the substring of _templateRemainder_ from 0 to 1 + _d_.
-                1. Let _digits_ be the substring of _templateRemainder_ from 1 to 1 + _d_.
+                1. If _templateRemainder_ starts with *"$"* followed by 2 or more decimal digits, let _digitCount_ be 2. Otherwise, let _digitCount_ be 1.
+                1. Let _ref_ be the substring of _templateRemainder_ from 0 to 1 + _digitCount_.
+                1. Let _digits_ be the substring of _templateRemainder_ from 1 to 1 + _digitCount_.
                 1. Let _index_ be ℝ(StringToNumber(_digits_)).
                 1. Assert: 0 &le; _index_ &le; 99.
                 1. If 0 &lt; _index_ &le; the number of elements in _captures_, then