Add Learn guide link to CPY Essentials for analogio

Author: tekktrik

shared-bindings/analogio/__init__.c

@@ -57,7 +57,15 @@
 //| This example will initialize the the device, read
 //| :py:data:`~analogio.AnalogIn.value` and then
 //| :py:meth:`~analogio.AnalogIn.deinit` the hardware. The last step is optional
-//| because CircuitPython will do it automatically after the program finishes."""
+//| because CircuitPython will do it automatically after the program finishes.
+//|
+//| For the essentials of `analogio`, see the CircuitPython Essentials
+//| Learn guide:
+//| https://learn.adafruit.com/circuitpython-essentials/circuitpython-analog-in
+//|
+//| For more information on using `analogio`, see this additional Learn guide:
+//| https://learn.adafruit.com/circuitpython-basics-analog-inputs-and-outputs
+//| """
 //|
 
 STATIC const mp_rom_map_elem_t analogio_module_globals_table[] = {