Explain why an environment name might be invalid
Explain why an environment name might be invalid

See #442
cloudvox/adhearsion,kares/adhearsion,adhearsion/adhearsion,cloudvox/adhearsion,cloudvox/adhearsion,cloudvox/adhearsion,renemendoza/adhearsion,renemendoza/adhearsion,adhearsion/adhearsion,adhearsion/adhearsion,adhearsion/adhearsion,kares/adhearsion,renemendoza/adhearsion