Update source/iterators.tex

Co-authored-by: Jan Schultke <[email protected]>

Author: AlisdairM

source/iterators.tex

@@ -7459,7 +7459,7 @@
 
 \indexlibrary{\idxcode{ssize(C\& c)}}%
 \begin{itemdecl}
-template<class C> constexpr auto ssize(const C& c) noexcept(noexcept(c.ssize()))
+template<class C> constexpr auto ssize(const C& c) noexcept(noexcept(c.size()))
   -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>;
 \end{itemdecl}
 \begin{itemdescr}