[defns.access] Add cross-reference (#7743)

Author: LucyEngine

source/intro.tex

@@ -89,7 +89,7 @@
 read or modify the value of an object
 
 \begin{defnote}
-Only glvalues of scalar type can be used to access objects.
+Only glvalues of scalar type\iref{basic.types.general} can be used to access objects.
 Reads of scalar objects are described in \ref{conv.lval} and
 modifications of scalar objects are described in
 \ref{expr.assign}, \ref{expr.post.incr}, and \ref{expr.pre.incr}.