Update to dsmr water metering documentation (#5321)

* Update to dsmr water metering documentation

Resubmit of forgotten documentation PR #2464 of already released feature esphome/esphome#4237.

* Minor formating fixes

---------

Co-authored-by: Jonathan Swoboda <[email protected]>

Author: SixFive7

content/components/sensor/dsmr.md

@@ -45,6 +45,7 @@ Configuration variables:
   telegrams. Used in Lux only.
 
 - **gas_mbus_id** (*Optional*, int): The id of the gas meter. Defaults to `1`.
+- **water_mbus_id** (*Optional*, int): The id of the water meter. Defaults to `2`.
 - **crc_check** (*Optional*, boolean): Specifies if the CRC check must be done. This is required to be set to false for
   older DSMR versions as they do not provide a CRC. Defaults to `true`.
 
@@ -184,6 +185,10 @@ Configuration variables:
 
   - All options from [Sensor](#config-sensor).
 
+- **water_delivered** (*Optional*): Water Consumed.
+
+  - All options from [Sensor](#config-sensor).
+
 Belgium
 
 - **gas_delivered_be** (*Optional*): Gas Consumed Belgium.