remove content about non-inherited coords for a follow-up PR

Author: TomNicholas

doc/user-guide/hierarchical-data.rst

@@ -798,58 +798,3 @@ We can also still perform all the same operations on the whole tree:
     dt.std(dim="time")
 
 (TODO: The second one fails due to https://github.com/pydata/xarray/issues/8949)
-
-.. _overriding-inherited-coordinates:
-
-Overriding Inherited Coordinates
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-We can override inherited coordinates with newly-defined ones on child nodes, as long as those newly-defined coordinates also align with the parent nodes.
-
-You may want to do this if some child dataset follows the same pattern as its siblings but contains different specific values of a coordinate.
-
-Let's image we had three different datasets, on two different lat-lon grids:
-
-.. ipython:: python
-
-lon1, lat1 = np.meshgrid(np.linspace(-20, 20, 5), np.linspace(0, 30, 4))
-grid1 = xr.Coordinates({'lat': lat1, 'lon': lon1})
-
-# a different grid with the same sizes
-lon2 = lat1 + (lat1 / 10)
-lat2 = lon1 + (lon1 / 10)
-grid1 = xr.Coordinates({'lat': lat2, 'lon': lon2})
-
-    # model_ds1 = xr.Dataset()
-    # model_ds2 = xr.Dataset()
-    # model_ds3 = xr.Dataset()
-
-We could arrange these in a datatree
-
-.. ipython:: python
-
-    dt = xr.DataTree.from_dict(
-        {
-            "/": Dataset(coords=grid1),
-            "model1": None,
-            "model2": None,
-            "model3": Dataset(coords=grid2),
-        }
-    )
-    dt
-
-However in this you could also have reprented this without overriding, by using an extra layer of nodes in the tree:
-
-
-.. _overriding-inherited-coordinates:
-
-Non-Inherited Coordinates
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Only coordinates which are backed by an index are inherited. This is because index-backed coordinates can be efficiently de-duplicated between parents and children, preventing ambiguity
-
-
-
-EXAMPLE OF INHERITING FROM A GRANDPARENT?
-
-EXPLAIN DEDUPLICATION?