[version.syn] Add <expected> to headers for __cpp_lib_constrained_equality

Author: jensmaurer

source/support.tex

@@ -619,7 +619,7 @@
 #define @\defnlibxname{cpp_lib_constexpr_utility}@                 201811L // freestanding, also in \libheader{utility}
 #define @\defnlibxname{cpp_lib_constexpr_vector}@                  201907L // also in \libheader{vector}
 #define @\defnlibxname{cpp_lib_constrained_equality}@              202411L // freestanding,
-  // also in \libheader{utility}, \libheader{tuple}, \libheader{optional}, \libheader{variant}
+  // also in \libheader{utility}, \libheader{tuple}, \libheader{optional}, \libheader{variant}, \libheader{expected}
 #define @\defnlibxname{cpp_lib_containers_ranges}@                 202202L
   // also in \libheader{vector}, \libheader{list}, \libheader{forward_list}, \libheader{map}, \libheader{set}, \libheader{unordered_map}, \libheader{unordered_set},
   // \libheader{deque}, \libheader{queue}, \libheader{stack}, \libheader{string}