Remove notes about shared memory from the lock free recommendation

Author: huixie90

source/threads.tex

@@ -3135,11 +3135,6 @@
 communicate atomically.
 \end{footnote}
 The implementation of these operations should not depend on any per-process state.
-\begin{note}
-This restriction enables communication by memory that is
-mapped into a process more than once and by memory that is shared between two
-processes.
-\end{note}
 
 \rSec2[atomics.wait]{Waiting and notifying}