Fix header level for 'Constants' section of math.rst

diff --git a/Doc/library/math.rst b/Doc/library/math.rst
index d59296a2dbd4f587ed4e08e1e93fa999b2eb95dc..d44b34d7921642ee047ffbdc7472e1f15f6a40b6 100644 (file)
--- a/Doc/library/math.rst
+++ b/Doc/library/math.rst
@@ -277,7 +277,7 @@ Hyperbolic functions
 
 
 Constants
-=========
+---------
 
 .. data:: pi