[futures.async] Avoid note within a sentence.

Author: jensmaurer

source/threads.tex

@@ -7164,25 +7164,15 @@
 
 \pnum
 \sync
-Regardless of the provided \tcode{policy} argument,
-\begin{itemize}
-\item
-the invocation of \tcode{async}
-synchronizes with\iref{intro.multithread} the invocation of \tcode{f}.
+The invocation of \tcode{async} synchronizes with the invocation of \tcode{f}.
+The completion of the function \tcode{f} is sequenced before
+the shared state is made ready.
 \begin{note}
-This statement applies even when the corresponding \tcode{future} object is moved to
-another thread.
-\end{note}
-; and
-
-\item
-the completion of the function \tcode{f} is sequenced before\iref{intro.multithread} the
-shared state is made ready.
-\begin{note}
-\tcode{f} might not be called at all,
+These apply regardless of the provided \tcode{policy} argument, and
+even if the corresponding \tcode{future} object is moved to another thread.
+However, \tcode{f} might not be called at all,
 so its completion might never happen.
 \end{note}
-\end{itemize}
 
 If the implementation chooses the \tcode{launch::async} policy,
 \begin{itemize}