[simd.complex.access] Wrap "cmplx-func" placeholder in \tcode

Author: eisenwave

source/numerics.tex

@@ -17957,7 +17957,7 @@
 An object of type \tcode{rebind_t<typename T::value_type, basic_vec>}
 where the $i^\text{th}$ element is initialized to the result of
 \tcode{\placeholder{cmplx-func}(operator[]($i$))} for all $i$ in the range
-\range{0}{size()}, where \placeholder{cmplx-func} is the corresponding function
+\range{0}{size()}, where \tcode{\placeholder{cmplx-func}} is the corresponding function
 from \libheader{complex}.
 \end{itemdescr}