[exec.snd.transform] Fix "tag2" => "tag".

Misapplication of P3826R5 in LWG Motion 28.

Addresses editorial review committee feedback.

Author: tkoeppe

source/exec.tex

@@ -2933,7 +2933,7 @@
 if\newline \tcode{\exposid{transformed-sndr}(dom, tag, s)} and \exposid{s}
 have the same type ignoring cv-qualifiers;
 otherwise, it is
-the expression \tcode{\exposid{transform-recurse}(dom2, tag2, s2)}, where
+the expression \tcode{\exposid{transform-recurse}(dom2, tag, s2)}, where
 \tcode{s2} is \tcode{\exposid{transformed-sender}(dom, tag, s)} and
 \tcode{dom2} is \exposid{start-domain} if \tcode{tag} is \tcode{start}, and
 \tcode{\exposid{completion-domain}(s2)} otherwise.