[futures.task.members] Correct capitalization

Author: hewillk

source/threads.tex

@@ -11562,7 +11562,7 @@
 \throws
 \begin{itemize}
 \item \tcode{bad_alloc} if memory for the new shared state cannot be allocated.
-\item any exception thrown by the move constructor of the task stored in the shared
+\item Any exception thrown by the move constructor of the task stored in the shared
 state.
 \item \tcode{future_error} with an error condition of \tcode{no_state} if \tcode{*this}
 has no shared state.