Fixed link typo

docs/delegate-resources/usability-exercises.rst

@@ -42,10 +42,10 @@ and might be much faster depending on RSP experience.
 **Resources.**
 First, try the exercise on its own, then use any of these resources
 which are relevant.
-The `DP0.2 documentation <http://dp0-2.lsst_io>`_,
+The `DP0.2 documentation <http://dp0-2.lsst.io>`_,
 `DP0.2 schema browser <https://dm.lsst.org/sdm_schemas/browser/dp02.html>`_,
 and `DP0.2 Portal tutorials <https://dp0-2.lsst.io/tutorials-examples/index.html#portal-tutorials>`_.
-The `DP0.3 documentation <http://dp0-3.lsst_io>`_,
+The `DP0.3 documentation <http://dp0-3.lsst.io>`_,
 `DP0.3 schema browser <https://dm.lsst.org/sdm_schemas/browser/dp03.html>`_,
 and `DP0.3 Portal tutorials <https://dp0-3.lsst.io/tutorials-dp0-3/index.html>`_.
 The `Portal (Firefly) Help pages <https://data.lsst.cloud/portal/app/onlinehelp/>`_ (image display).