DOC: Explicate that Annotations onsets & durations are in seconds [skip github] [skip azp] (#9329)
DOC: Explicate that Annotations onsets & durations are in seconds [skip github] [skip azp] (#9329)

This is already mentioned in the text above the respective code block,
but the question came up anyway on the forum. So let's be even more
explicit.

https://mne.discourse.group/t/annotating-continuous-data
pravsripad/mne-python,larsoner/mne-python,bloyl/mne-python,pravsripad/mne-python,rkmaddox/mne-python,wmvanvliet/mne-python,drammock/mne-python,wmvanvliet/mne-python,larsoner/mne-python,rkmaddox/mne-python,pravsripad/mne-python,wmvanvliet/mne-python,Eric89GXL/mne-python,Eric89GXL/mne-python,kingjr/mne-python,bloyl/mne-python,larsoner/mne-python,drammock/mne-python,kingjr/mne-python,olafhauk/mne-python,kingjr/mne-python,mne-tools/mne-python,drammock/mne-python,olafhauk/mne-python,mne-tools/mne-python,Teekuningas/mne-python,olafhauk/mne-python,Teekuningas/mne-python,Teekuningas/mne-python,mne-tools/mne-python