Signed-off-by: Damien George <damien@micropython.org>
Latest versions of Sphinx (at least 3.1.0) do not need the `*` escaped and will render the `\` in the output if it is there, so remove it. Fixes issue #6209.
To signify that this ADC documentation is specific to the WiPy, and to make way for a standardised ADC documentation.