Update doc to reflect Tim's changes to bool.
diff --git a/Doc/lib/libmutex.tex b/Doc/lib/libmutex.tex
index e2c34f2..4893690 100644
--- a/Doc/lib/libmutex.tex
+++ b/Doc/lib/libmutex.tex
@@ -41,7 +41,7 @@
 
 \begin{methoddesc}{testandset}{}
 ``Atomic'' test-and-set, grab the lock if it is not set,
-and return true, otherwise, return false.
+and return \code{True}, otherwise, return \code{False}.
 \end{methoddesc}
 
 \begin{methoddesc}{lock}{function, argument}