Remove setting read-only __doc__ in Member overrides.
Remove setting read-only __doc__ in Member overrides.

mgardne8/discord.py,lgkern/PriestPy,jhgg/discord.py,Rapptz/discord.py,imayhaveborkedit/discord.py,rapptz/discord.py,Harmon758/discord.py,variablehair/Eggplantato,Theoretical/UselessBot,Harmon758/discord.py,khazhyk/discord.py