[charconv.to.chars] Update to refer to C23 7.23.6.2

Author: frederick-vs-ja

source/text.tex

@@ -233,7 +233,7 @@
 Nothing.
 \end{itemdescr}
 
-\xrefc{7.21.6.1}
+\xrefc{7.23.6.2}
 
 \rSec2[charconv.from.chars]{Primitive numeric input conversion}