[thread.condition.condvarany] Remove note made incorrect by LWG 2135.

Fixes #1755.

Author: jensmaurer

source/threads.tex

@@ -3442,13 +3442,6 @@
 \end{itemdecl}
 
 \begin{itemdescr}
-\pnum
-\begin{note}
-If any of the \tcode{wait} functions exits via an exception, it is
-unspecified whether the \tcode{Lock} is held. One can use a \tcode{Lock} type
-that allows to query that, such as the \tcode{unique_lock} wrapper.
-\end{note}
-
 \pnum
 \effects
 \begin{itemize}