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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 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 when for operation over a flat surface as the local NED origin will move
up and down with ground level. 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 type: enum
values: values:
0: Barometric pressure 0: Barometric pressure