Update docs for bool changes by Guido around April 6
diff --git a/Doc/lib/libthread.tex b/Doc/lib/libthread.tex
index 328e9b7..227dd3d 100644
--- a/Doc/lib/libthread.tex
+++ b/Doc/lib/libthread.tex
@@ -82,8 +82,8 @@
value: if it is zero, the lock is only acquired if it can be acquired
immediately without waiting, while if it is nonzero, the lock is
acquired unconditionally as before. If an argument is present, the
-return value is \code{1} if the lock is acquired successfully,
-\code{0} if not.
+return value is \code{True} if the lock is acquired successfully,
+\code{False} if not.
\end{methoddesc}
\begin{methoddesc}[lock]{release}{}
@@ -92,8 +92,8 @@
\end{methoddesc}
\begin{methoddesc}[lock]{locked}{}
-Return the status of the lock:\ \code{1} if it has been acquired by
-some thread, \code{0} if not.
+Return the status of the lock:\ \code{True} if it has been acquired by
+some thread, \code{False} if not.
\end{methoddesc}
\strong{Caveats:}