master is now failing due to a doctest

[kosack]

The doctest in SimTelEventSource is causing the following failure (not sure why it didn't happen in the PR version):

[gw1] linux -- Python 3.8.10 /usr/share/miniconda/envs/ci/bin/python
022     To create an instance of an EventSeeker you must provide it a sub-class of
023     `~ctapipe.io.EventSource` (such as `ctapipe.io.SimTelEventSource`),
024     which will be used to loop through the file and provide the event container,
025     filled with the event information using the methods defined in the
026     event_source for that file format.
027 
028     To obtain a particular event in a simtel file:
029 
030     >>> from ctapipe.io import SimTelEventSource
031     >>> event_source = SimTelEventSource(input_url="dataset://gamma_test_large.simtel.gz")
Expected nothing
Got:
    SIMTEL INIT dataset://gamma_test_large.simtel.gz

/home/runner/work/ctapipe/ctapipe/ctapipe/io/eventseeker.py:31: DocTestFailure

Probably just needs to be changed to an Example section, rather than a doctest. Though I cannot find where the text "SIMTEL INIT" is coming from.

[maxnoe]

sorry, my bad, that's a debug print still in there.

❯ rg 'SIMTEL INIT'
ctapipe/io/simteleventsource.py
232:        print("SIMTEL INIT", input_url)