[basic.link] Reword sentence to make it more obvious how it's supposed

to be parsed.

Author: zygoloid

source/basic.tex

@@ -2333,7 +2333,8 @@
 \item it is a class or enumeration type that is named (or has a name for
 linkage purposes~(\ref{dcl.typedef})) and the name has linkage; or
 
-\item it is an unnamed class or enumeration member of a class with linkage; or
+\item it is an unnamed class or unnamed enumeration that is a member of a class
+with linkage; or
 
 \item it is a specialization of a class template (Clause~\ref{temp})\footnote{A class
 template has the linkage of the innermost enclosing class or namespace in which