Remove trailing whitespace.
diff --git a/Doc/library/sched.rst b/Doc/library/sched.rst
index e0007fc..cab7f60 100644
--- a/Doc/library/sched.rst
+++ b/Doc/library/sched.rst
@@ -42,7 +42,7 @@
930343700.276
In multi-threaded environments, the :class:`scheduler` class has limitations
-with respect to thread-safety, inability to insert a new task before
+with respect to thread-safety, inability to insert a new task before
the one currently pending in a running scheduler, and holding up the main
thread until the event queue is empty. Instead, the preferred approach
is to use the :class:`threading.Timer` class instead.