[Documentation]: Add How-to guide on editing NWB files With MatNWB / MATLAB

[ehennestad]

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

Add How-to guide following the lead of the current PyNWB tutorial for editing NWB files:
https://pynwb.readthedocs.io/en/latest/tutorials/advanced_io/plot_editing.html#sphx-glr-tutorials-advanced-io-plot-editing-py

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

Yes.

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