[defns.argument] Mention braced-init-list

Author: lprv

source/intro.tex

@@ -103,8 +103,9 @@
 \indexdefn{argument}%
 \indexdefn{argument!function call expression}
 \definition{argument}{defns.argument}
-\defncontext{function call expression} expression in the
-comma-separated list bounded by the parentheses
+\defncontext{function call expression}
+expression or \grammarterm{braced-init-list}
+in the comma-separated list bounded by the parentheses
 
 \indexdefn{argument}%
 \indexdefn{argument!function-like macro}%