Update whats-new.rst

Author: dcherian

doc/whats-new.rst

@@ -25,6 +25,8 @@ New Features
 
 - Fix :py:meth:`xr.cov` and :py:meth:`xr.corr` now support complex valued arrays  (:issue:`7340`, :pull:`7392`).
   By `Michael Niklas <https://github.com/headtr1ck>`_.
+- Use fastpath when grouping both montonically increasing and decreasing variable
+  in :py:class:`GroupBy` (:issue:`6220`, :pull:`7427`). By `Joel Jaeschke <https://github.com/joeljaeschke>`_.
 
 Breaking changes
 ~~~~~~~~~~~~~~~~
@@ -87,11 +89,6 @@ Deprecations
   and will be removed in a future version of xarray (:issue:`6985`:,
   :pull:`7373`).  By `Spencer Clark <https://github.com/spencerkclark>`_.
 
-Enhancements
-~~~~~~~~~~~
-
-- Use fastpath when grouping both montonically increasing and decreasing variable
-  in :py:class:`GroupBy` (:issue:`6220`, :pull:`7427`). By `Joel Jaeschke <https://github.com/joeljaeschke>`_.
 
 Bug fixes
 ~~~~~~~~~