[dcl.init.list] Replace misuse of \grammarterm with \defn

Author: jensmaurer

source/declarators.tex

@@ -3739,7 +3739,7 @@
 List-initialization can occur in direct-initialization or copy-initialization contexts;
 list-initialization in a direct-initialization context is called
 \grammarterm{direct-list-initialization} and list-initialization in a
-copy-initialization context is called \grammarterm{copy-list-initialization}. \begin{note}
+copy-initialization context is called \defn{copy-list-initialization}. \begin{note}
 List-initialization can be used
 
 \begin{itemize}