Update doc samples

SetStatus and SetGame don't exist, only SetStatusAsync and SetGameAsync

Intended to make the Home more than a placeholder, and more homey

Typically, you will want to mark his method as `async`, although it is 
not required. 

Changed `his` to `this`

CheckPermissions was not set to async so await would not work.

await commands.LoadAssembly(Assembly.GetCurrentAssembly(), map);
->
await commands.AddModulesAsync(Assembly.GetEntryAssembly());

if (!result.IsSuccess)
    await msg.Channel.SendMessageAsync(result.ErrorReason);
}
msg -> context

this one took a while

Resolves #280

As changed in 23a0316252

some users were having trouble with this

Resolves #223

oops