[futures.async] Avoid note within a sentence.

Author: jensmaurer

source/threads.tex

@@ -7168,12 +7168,8 @@
 \begin{itemize}
 \item
 the invocation of \tcode{async}
-synchronizes with\iref{intro.multithread} the invocation of \tcode{f}.
-\begin{note}
-This statement applies even when the corresponding \tcode{future} object is moved to
-another thread.
-\end{note}
-; and
+synchronizes with\iref{intro.multithread} the invocation of \tcode{f}
+and
 
 \item
 the completion of the function \tcode{f} is sequenced before\iref{intro.multithread} the
@@ -7184,6 +7180,11 @@
 \end{note}
 \end{itemize}
 
+\begin{note}
+These statements apply even when the corresponding \tcode{future} object is moved to
+another thread.
+\end{note}
+
 If the implementation chooses the \tcode{launch::async} policy,
 \begin{itemize}
 \item