docs: Compound WaterSensor is not documented.

[ntlhui]

• src/watersensor/waterSensor.hpp:27: error: Compound WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:47: error: Member WaterSensor(uint8_t water_detect_en_pin, uint8_t water_detect_pin_to_set, uint8_t window_size) (function) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:31: error: Member water_detect_en_pin (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:32: error: Member water_detect_pin (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:34: error: Member moving_window_size (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:35: error: Member low_detect_percentage (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:36: error: Member high_detect_percentage (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:38: error: Member samples_taken_since_reset (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:40: error: Member array_sum (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:42: error: Member array_location (variable) of class WaterSensor is not documented.
• src/watersensor/waterSensor.hpp:44: error: Member last_water_detect (variable) of class WaterSensor is not documented.
• :1: error: parameters of member WaterSensor::WaterSensor are not documented
• <~WaterSensor>:1: error: parameters of member WaterSensor::~WaterSensor are not documented

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