[skip-ci] update whats-new

Author: dcherian

doc/whats-new.rst

@@ -32,6 +32,11 @@ Deprecations
 Bug fixes
 ~~~~~~~~~
 
+Documentation
+~~~~~~~~~~~~~
+
+- Significant improvements to  :ref:`api`. By `Deepak Cherian <https://github.com/dcherian>`_.
+
 Internal Changes
 ~~~~~~~~~~~~~~~~
 
@@ -151,7 +156,6 @@ Documentation
 - A clearer error is now raised if a user attempts to assign a Dataset to a single key of
   another Dataset. (:pull:`5839`)
   By `Tom Nicholas <https://github.com/TomNicholas>`_.
-- Significant improvements to  :ref:`api`. By `Deepak Cherian <https://github.com/dcherian>`_.
 
 Internal Changes
 ~~~~~~~~~~~~~~~~