Added the auto_update parameter to the docs.

[elsif2]

Minor update to the shadowserver parser documentation.

[elsif2]

@sebix All unit tests failed with:

=========================== short test summary info ============================
FAILED intelmq/tests/bots/experts/ripe/test_expert.py::TestRIPEExpertBot::test_db_ipv4_lookup - AssertionError: {'__type': 'Event', 'source.ip': '93.184.21[170 chars]5492} != {'source.ip': '93.184.216.34', 'destination[153 chars]ent'}
  {'__type': 'Event',
   'destination.abuse_contact': '[email protected]',
   'destination.asn': 35492,
   'destination.ip': '193.238.157.5',
-  'source.abuse_contact': '[email protected]',
?                                 ---------------   --- -

+  'source.abuse_contact': '[email protected]',
?                                   ++

   'source.ip': '93.184.216.34'}
====== 1 failed, 1118 passed, 42 skipped, 4 xfailed in 154.06s (0:02:34) =======

[sebix]

@sebix All unit tests failed with:

Fix will come with #2504