[dcl.type.elab] Clarify 'declaration'.

Author: jensmaurer

source/declarations.tex

@@ -1473,8 +1473,8 @@
 
 \pnum
 If an \grammarterm{elaborated-type-specifier} appears with
-the \keyword{friend} specifier as an entire declaration,
-the declaration shall have one of the following forms:
+the \keyword{friend} specifier as an entire \grammarterm{member-declaration},
+the \grammarterm{member-declaration} shall have one of the following forms:
 \begin{ncsimplebnf}
 \keyword{friend} class-key \opt{nested-name-specifier} identifier \terminal{;}\br
 \keyword{friend} class-key simple-template-id \terminal{;}\br