[basic.lookup.unqual] Rephrase to avoid incorrect use of term

Author: lprv

source/basic.tex

@@ -2063,7 +2063,8 @@
 \pnum
 In a friend declaration \grammarterm{declarator}
 whose \grammarterm{declarator-id} is a \grammarterm{qualified-id}
-whose lookup context\iref{basic.lookup.qual} is a class or namespace $S$,
+whose \grammarterm{nested-name-specifier}
+designates a class or namespace $S$\iref{expr.prim.id.qual},
 lookup for an unqualified name
 that appears after the \grammarterm{declarator-id}
 performs a search in the scope associated with $S$.