[ranges.cartesian.iterator] Fix typo

Author: hewillk

source/ranges.tex

@@ -14958,7 +14958,7 @@
 for every integer\newline $0 \le N \le \tcode{sizeof...(Vs)}$,
 \item
 \tcode{is_nothrow_move_constructible_v<range_rvalue_reference_t<\exposid{maybe-const}<Const, T>>>}\newline
-for every type \tcode{T} in \tcode{F, Vs...}.
+for every type \tcode{T} in \tcode{First, Vs...}.
 \end{itemize}
 \end{itemdescr}