[futures.async] Avoid note within a sentence.

Author: jensmaurer

source/threads.tex

@@ -7164,19 +7164,18 @@
 
 \pnum
 \sync
-Regardless of the provided \tcode{policy} argument,
+The following apply regardless of the provided \tcode{policy} argument:
 \begin{itemize}
 \item
-the invocation of \tcode{async}
+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
 
 \item
-the completion of the function \tcode{f} is sequenced before\iref{intro.multithread} the
+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,