[coroutine.noop.coroutine] Use code font for noop_coroutine index entry. (#4133)

Author: Eelis

source/support.tex

@@ -5358,7 +5358,7 @@
 
 \rSec3[coroutine.noop.coroutine]{Function \tcode{noop_coroutine}}
 
-\indexlibrary{noop_coroutine}%
+\indexlibraryglobal{noop_coroutine}%
 \begin{itemdecl}
 noop_coroutine_handle noop_coroutine() noexcept;
 \end{itemdecl}