Fix overfull hboxes.

Author: zygoloid

source/threads.tex

@@ -526,7 +526,7 @@
 std::forward<F>(f)),
 \placeholdernc{DECAY_COPY}(\brk{}%
 std::forward<Args>(\brk{}args))...)}~(\ref{func.require}) shall be
-a valid expression.
+a va\-lid expression.
 
 \pnum
 \remarks
@@ -545,9 +545,13 @@
 is ignored. \begin{note} This implies that any exceptions not thrown from the invocation of the copy
 of \tcode{f} will be thrown in the constructing thread, not the new thread. \end{note} If the
 invocation of
-\tcode{\placeholdernc{INVOKE}(\placeholdernc{DECAY_COPY}(}
-\tcode{std::forward<F>(f)), \placeholdernc{DECAY_COPY}(std::forward<Args>(args))...)}
-terminates with an uncaught exception, \tcode{terminate} shall be called.
+\tcode{%
+\placeholdernc{INVOKE}(\brk{}%
+\placeholdernc{DECAY_COPY}(\brk{}%
+std::forward<F>(f)),
+\placeholdernc{DECAY_COPY}(\brk{}%
+std::forward<Args>(args))...)}
+termi\-nates with an uncaught exception, \tcode{terminate} shall be called.
 
 
 \pnum\sync The completion of the invocation of the constructor
@@ -2790,10 +2794,10 @@
 \begin{itemdescr}
 \pnum
 \requires
-\tcode{\placeholdernc{INVOKE}(\brk{}%
-std::forward<Callable>(func),
-std::forward<Args>(args)...)}~(\ref{func.require}) shall be
-a valid expression.
+\begin{codeblock}
+@\placeholdernc{INVOKE}@(std::forward<Callable>(func), std::forward<Args>(args)...)
+\end{codeblock}
+(see \ref{func.require}) shall be a valid expression.
 
 \pnum
 \effects An execution of \tcode{call_once} that does not call its \tcode{func} is a