Fix minor error in prose on reduce_min/max_index

ChangeLog:

	* P1928/main.tex:

P1928/main.tex

@@ -907,7 +907,7 @@ \subsubsection{Suggested Polls}
 {&&&&}
 
 \wgPoll{Return \code{std::optional<\simdsizetype>} from
-\code{reduce_min_index(empty_mask)} and \code{reduce_max_index(empty_mask)}.}
+\code{reduce_min_index} and \code{reduce_max_index}.}
 {&&&&}
 
 \section{Wording: Add Section 9 of N4808 with modifications}\label{sec:wording}