[expr.prim.req.compound] Move compound requirement example from inner to outer bullet (#6159)

Example 1 from [expr.prim.req.compound] is currently attached to the
inner bullet point, but should be attached to the outer one.

Author: brevzin

source/expressions.tex

@@ -2969,6 +2969,7 @@
 The immediately-declared constraint\iref{temp.param}
 of the \grammarterm{type-constraint} for \tcode{\keyword{decltype}((E))}
 shall be satisfied.
+\end{itemize}
 \begin{example}
 Given concepts \tcode{C} and \tcode{D},
 \begin{codeblock}
@@ -2987,8 +2988,6 @@
 (including in the case where $n$ is zero).
 \end{example}
 \end{itemize}
-\end{itemize}
-
 \pnum
 \begin{example}
 \begin{codeblock}