[basic.types.general] Add missing \tcode in comment

Author: Andreas-Krug

source/basic.tex

@@ -5293,7 +5293,7 @@
 \begin{codeblock}
 class X;                        // \tcode{X} is an incomplete type
 extern X* xp;                   // \tcode{xp} is a pointer to an incomplete type
-extern int arr[];               // the type of arr is incomplete
+extern int arr[];               // the type of \tcode{arr} is incomplete
 typedef int UNKA[];             // \tcode{UNKA} is an incomplete type
 UNKA* arrp;                     // \tcode{arrp} is a pointer to an incomplete type
 UNKA** arrpp;