Proposed documentation enhancement

A few suggestions to add clarity around the many different types of channel which can be called sensor types, including the sub-denomination of data channels:

=> Change the pre-existing data channels section from the Glossary (data channels) to be included in a global section sensor types. The sensor types section will contain an additional subsection other channel listing other channel types (the non-brain ones).

=> Add a link referencing the glossary term sensor types inside the note in the documentation of the set_channel_types method (for all data classes).

=> Add all other non listed sensor types and add a link to sensor types in this tutorial paragraph:
https://mne.tools/stable/auto_tutorials/raw/10_raw_overview.html#changing-channel-name-and-type

The method takes a dictionary mapping channel names to types; allowed types are ecg, eeg, emg, eog, exci, ias, misc, resp, seeg, dbs, stim, syst, ecog, hbo, hbr.