Clarify that Client.close is a coroutine.
Clarify that Client.close is a coroutine.

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