Minor markup nit to ease conversion processing.
diff --git a/Doc/lib/libthread.tex b/Doc/lib/libthread.tex
index df87118..777c76f 100644
--- a/Doc/lib/libthread.tex
+++ b/Doc/lib/libthread.tex
@@ -79,8 +79,8 @@
unconditionally, if necessary waiting until it is released by another
thread (only one thread at a time can acquire a lock --- that's their
reason for existence), and returns \code{None}. If the integer
-\var{waitflag} argument is present, the action depends on its value:\
-if it is zero, the lock is only acquired if it can be acquired
+\var{waitflag} argument is present, the action depends on its
+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,