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docs(ekf2): clarify EKF2_HGT_REF param description (#26725)

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* docs(ekf2): clarify EKF2_HGT_REF param description

To me it was not obvious that with EKF2_GPS_CTRL=0 this altitude
initialisation based on GPS again does not apply.

* docs(ekf2): separate paragraph
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src/modules/ekf2/module.yaml
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@ -92,8 +92,10 @@ parameters:
by this parameter. The range sensor and vision options should only be used
when for operation over a flat surface as the local NED origin will move
up and down with ground level.
If GPS is set as reference but altitude fusion is disabled in EKF2_GPS_CTRL,
the GPS altitude is still used to initiaize the bias of the other height sensors.
If GPS is set as reference and EKF2_GPS_CTRL is not 0, the GPS altitude is
still used to initiaize the bias of the other height sensors, regardless of
the altitude fusion bit in EKF2_GPS_CTRL.
type: enum
values:
0: Barometric pressure