[expr.reflect] Delete sentence from "interpretation" list item that is redundant with the next item.

The next item already describes the case where R represents a namespace.

Author: tkoeppe

source/expressions.tex

@@ -6724,8 +6724,6 @@
 \item
 Otherwise, if lookup finds a namespace alias\iref{namespace.alias},
 $R$ represents that namespace alias.
-For any other \grammarterm{namespace-name},
-$R$ represents the denoted namespace.
 \item
 Otherwise, if lookup finds a namespace\iref{basic.namespace},
 $R$ represents that namespace.