DOC: Fix heading level for assign

Tom Augspurger · Tom Augspurger · commit 5a0aba44ceb5 · 2015-03-13T14:47:27.000-05:00
diff --git a/doc/source/dsintro.rst b/doc/source/dsintro.rst
@@ -453,7 +453,7 @@ available to insert at a particular location in the columns:
 .. _dsintro.chained_assignment:
 
 Assigning New Columns in Method Chains
---------------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 .. versionadded:: 0.16.0
 
