[Documentation]: Update list of required fields for ElectrodeTable in ecephys tutorial

[stephprince]

What would you like changed or added to the documentation and why?

In the MatNWB extracellular electrophysiology tutorial, the documentation says that electrodes has several required fields:

Extracellular electrodes are stored in an electrodes table, which is also a DynamicTable. electrodes has several required fields: x, y, z, impedance, location, filtering, and electrode_group.

However with the latest version of the schema, I believe only the location and electrode_group fields should be required.

Do you have any interest in helping write or edit the documentation?

Yes.

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