Clarity around the sender/receiver in ShouldDeliverCallback.

[MaximumADHD]

Changes

Elaborated on the sender/receiver structure of TextChannel.ShouldDeliverCallback. My co-worker got confused while he was working on a problem with us and thought the callback only gave you information about who sent the message, since in Play Solo you would be the only sender and recipient of the message. After confirming how I suspected it actually worked, I went in and made this documentation change so others hopefully don't have similar confusion in the future.

Checks

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