Remove trailing whitespace.
diff --git a/Doc/library/heapq.rst b/Doc/library/heapq.rst
index 5138c83..4a18e02 100644
--- a/Doc/library/heapq.rst
+++ b/Doc/library/heapq.rst
@@ -100,7 +100,7 @@
    H
    N
 
-   
+
 The module also offers three general purpose functions based on heaps.