[stdckdint.h.syn] Improve indexing for macros

Author: AlisdairM

source/numerics.tex

@@ -18919,7 +18919,7 @@
 
 \indexheader{stdckdint.h}%
 \begin{codeblock}
-#define @\libglobal{__STDC_VERSION_STDCKDINT_H__}@ 202311L
+#define @\libmacro{__STDC_VERSION_STDCKDINT_H__}@ 202311L
 
 template<class type1, class type2, class type3>
   bool ckd_add(type1* result, type2 a, type3 b);