[Docs] Add to the ADC API documentation the analogReadMillivolts note about calibation

[pedrominatel]

Related area

Documentation

Hardware specification

N/A

Is your feature request related to a problem?

In the analogRead function, the value is the RAW value without the calibration, but for the analogReadMillivolts the values are calibrated.

adc2_get_raw - No calibrated data
esp_adc_cal_raw_to_voltage - Calibrated data

Describe the solution you'd like

Add to the adc2_get_raw and esp_adc_cal_raw_to_voltage function descriptions in the documentation the note about the calibration. Please don't change the API, only the documentation.

Source https://github.com/espressif/arduino-esp32/blob/2.0.6/docs/source/api/adc.rst#adc-common-api

Describe alternatives you've considered

N/A

Additional context

N/A

I have checked existing list of Feature requests and the Contribution Guide

• I confirm I have checked existing list of Feature requests and Contribution Guide.

[VojtechBartoska]

Closing.