AHT20.start_link

You're seeing just the function start_link, go back to AHT20 module for more information.
Link to this function

start_link(init_arg \\ [])

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Specs

start_link(options()) :: GenServer.on_start()

Start a new GenServer for interacting with a AHT20. Normally, you'll want to pass the :bus_name option to specify the I2C bus going to the AHT20.