fix remaining resp: respiration!=response

[sappelhoff]

I assume this is a leftover from:

• MRG: Unify pick_types parameter docstring #11022

came up in:

• BIDS channel type issue mne-bids#1046

cc @hoechenberger @larsoner

xref for why I label the units as "Volts":

• MRG: Change resp channel unit to Volts #8858

[hoechenberger]

Good catch!

[sappelhoff]

Also, there is an error in the changelog. Search for: read_raw_bti erroneously treated response channels as respiratory channels (#8855

the "8855" link seems wrong :)

[larsoner]

@sappelhoff feel free to fix the changelog, too

[sappelhoff]

feel free to fix the changelog, too

done, I found the correct one.

[larsoner]

Thanks @sappelhoff !

[larsoner]

Backported