DOC: Add a reference to window.rst in computation.rst (#37855)

Co-authored-by: Matt Roeschke <mroeschke@housecanary.com>

Author: mroeschke

doc/source/user_guide/computation.rst

@@ -205,3 +205,10 @@ parameter:
  - ``min`` : lowest rank in the group
  - ``max`` : highest rank in the group
  - ``first`` : ranks assigned in the order they appear in the array
+
+.. _computation.windowing:
+
+Windowing functions
+~~~~~~~~~~~~~~~~~~~
+
+See :ref:`the window operations user guide <window.overview>` for an overview of windowing functions.