Remove trailing whitespace.
diff --git a/Doc/library/heapq.rst b/Doc/library/heapq.rst
index 2190b80..bf7e3c4 100644
--- a/Doc/library/heapq.rst
+++ b/Doc/library/heapq.rst
@@ -102,7 +102,7 @@
    H
    N
 
-   
+
 The module also offers three general purpose functions based on heaps.