Update docs for limit info and link to example API notebook on GitHub

Author: manning-ncsa

apps.rst

@@ -1,6 +1,8 @@
 DESaccess Apps
 =============================
 
+Unless otherwise noted, user-submitted jobs are automatically terminated if they run beyond 24 hours. (Jobs submitted to the internal interface for the DES collaboration are terminated after 48 hours.) 
+
 .. include:: dbaccess.rst
 .. include:: cutout.rst
 .. include:: status.rst

examples.rst

@@ -4,7 +4,7 @@ Example Scripts
 Jupyter Notebooks
 ---------------------------------
 
-* `DESaccess API Examples <_static/DESaccess_API_example.ipynb>`_
+* `DESaccess API Examples <https://github.com/des-labs/desaccess-docs/blob/master/_static/DESaccess_API_example.ipynb>`_ (`direct download <_static/DESaccess_API_example.ipynb>`_)
 
 Download job files
 ---------------------------------