Extend UnitOfReactivePower with 'mvar' (#2752)

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: lboue

docs/core/entity/number.md

@@ -70,7 +70,7 @@ If specifying a device class, your number entity will need to also return the co
 | `NumberDeviceClass.PRECIPITATION_INTENSITY` | in/d, in/h, mm/d, mm/h | Precipitation intensity
 | `NumberDeviceClass.PRESSURE` | cbar, bar, hPa, mmHg, inHg, kPa, mbar, Pa, psi | Pressure.
 | `NumberDeviceClass.REACTIVE_ENERGY` | varh, kvarh | Reactive energy
-| `NumberDeviceClass.REACTIVE_POWER` | var, kvar | Reactive power
+| `NumberDeviceClass.REACTIVE_POWER` | mvar, var, kvar | Reactive power
 | `NumberDeviceClass.SIGNAL_STRENGTH` | dB, dBm | Signal strength
 | `NumberDeviceClass.SOUND_PRESSURE` | dB, dBA | Sound pressure
 | `NumberDeviceClass.SPEED` | ft/s, in/d, in/h, in/s, km/h, kn, m/s, mph, mm/d, mm/s | Generic speed

docs/core/entity/sensor.md

@@ -73,7 +73,7 @@ If specifying a device class, your sensor entity will need to also return the co
 | `SensorDeviceClass.PRECIPITATION_INTENSITY` | in/d, in/h, mm/d, mm/h | Precipitation intensity
 | `SensorDeviceClass.PRESSURE` | cbar, bar, hPa, mmHg, inHg, kPa, mbar, Pa, psi | Pressure.
 | `SensorDeviceClass.REACTIVE_ENERGY` | varh, kvarh | Reactive energy
-| `SensorDeviceClass.REACTIVE_POWER` | var, kvar | Reactive power
+| `SensorDeviceClass.REACTIVE_POWER` | mvar, var, kvar | Reactive power
 | `SensorDeviceClass.SIGNAL_STRENGTH` | dB, dBm | Signal strength
 | `SensorDeviceClass.SOUND_PRESSURE` | dB, dBA | Sound pressure
 | `SensorDeviceClass.SPEED` | ft/s, in/d, in/h, in/s, km/h, kn, m/s, mph, mm/d, mm/s | Generic speed