[stdbit.h.syn] Improve indexing for macros

Author: AlisdairM

source/utilities.tex

@@ -15485,11 +15485,11 @@
 
 \indexheader{stdbit.h}%
 \begin{codeblock}
-#define @\libglobal{__STDC_VERSION_STDBIT_H__}@ 202311L
+#define @\libmacro{__STDC_VERSION_STDBIT_H__}@ 202311L
 
-#define @\libglobal{__STDC_ENDIAN_BIG__}@     @\seebelow@
-#define @\libglobal{__STDC_ENDIAN_LITTLE__}@  @\seebelow@
-#define @\libglobal{__STDC_ENDIAN_NATIVE__}@  @\seebelow@
+#define @\libmacro{__STDC_ENDIAN_BIG__}@     @\seebelow@
+#define @\libmacro{__STDC_ENDIAN_LITTLE__}@  @\seebelow@
+#define @\libmacro{__STDC_ENDIAN_NATIVE__}@  @\seebelow@
 
 unsigned int @\libglobal{stdc_leading_zeros_uc}@(unsigned char value);
 unsigned int @\libglobal{stdc_leading_zeros_us}@(unsigned short value);