doc/next: list Regexp.AllStringSubmatch in release notes

The release note for the new regexp iterator methods listed
Regexp.AllStringIndex twice and omitted Regexp.AllStringSubmatch.

For #61902

Author: qwer9052

doc/next/6-stdlib/99-minor/regexp/61902.md

@@ -1,6 +1,6 @@
 <!-- go.dev/issue/61902 -->
 New [Regexp.All], [Regexp.AllIndex], [Regexp.AllString], [Regexp.AllStringIndex],
-[Regexp.AllStringIndex], [Regexp.AllStringSubmatchIndex], [Regexp.AllSubmatch], and
+[Regexp.AllStringSubmatch], [Regexp.AllStringSubmatchIndex], [Regexp.AllSubmatch], and
 [Regexp.AllSubmatchIndex] iterator methods on [Regexp] allow incremental matching of the input.
 
 The new [Regexp.SplitSeq] method iterates over the results of splitting the input with the