Fix unclosed response and document token login a bit better.
Fix unclosed response and document token login a bit better.

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