DOC: docstr for raw.get_montage does not make sense

[sappelhoff]

mne-python/mne/_fiff/meas_info.py

Line 317 in ac2c4c0

%(montage)s

see: https://mne.tools/stable/generated/mne.io.Raw.html#mne.io.Raw.get_montage

☝️ The description is as if this were a parameter, not a return value. Furthermore, it should specify that this returns a copy of a montage, so modifying this in any way won't have an impact on the raw instance from which it is obtained.

[larsoner]

Agreed!