add link to elevation tutorial in outputs

source/outputs.rst

@@ -48,6 +48,8 @@ DTM/DSM will only be created if the ``--dtm`` or ``--dsm`` options are used and
    :alt: image of OpenDroneMap derived digital surface model
    :align: center
    
+See `tutorial on elevation models <https://docs.opendronemap.org/using.html#creating-digital-elevation-models>`_ for more options in creating.
+
 List of all outputs
 ^^^^^^^^^^^^^^^^^^^