missed capes index

boards/capes/index.rst

+Capes
+#####
+
+.. note::
+   This page is under development.
+
+Capes are add-on boards for BeagleBone or PocketBeagle families of boards.
+
+* Learn about our compatibility layer on: `BeagleBone Cape Interface Specification </boards/capes/cape-interface-spec.html>`__
+
+
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+
+   /boards/capes/cape-interface-spec
+