Air heat pump slider description in households should refer to air-water heat pump

[mabijkerk]

The slider description for the Air heat pump in houdeholds is quite ambiguous as to whether it concerns air-water heat pumps or and air-air heat pump:

The node itself however is called households_space_heater_heatpump_air_water_electricity, meaning that it is an air-water heat pump. The slider description should updated to clearly refer to the air-water heat pump. @claudiavalkenier maybe you can pick this up at some point?

[github-actions]

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