Add whats-new entry for glob pattern group filtering

Author: aladinor

doc/whats-new.rst

@@ -17,6 +17,10 @@ New Features
 - Added ``inherit='all_coords'`` option to :py:meth:`DataTree.to_dataset` to inherit
   all parent coordinates, not just indexed ones (:issue:`10812`, :pull:`11230`).
   By `Alfonso Ladino <https://github.com/aladinor>`_.
+- Added glob pattern support to the ``group`` parameter of :py:func:`open_datatree`
+  and :py:func:`open_groups`, allowing patterns like ``"*/sweep_0"`` to selectively
+  open matching groups (:issue:`11196`).
+  By `Alfonso Ladino <https://github.com/aladinor>`_.
 
 Breaking Changes
 ~~~~~~~~~~~~~~~~