[commands] Fix indentation error in commands.bot_has_role docstring.
[commands] Fix indentation error in commands.bot_has_role docstring.

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