Fixed #25603 -- Made clear that geometry's SRID is meant in docs for GEOSGeometry.transform.

.. note::

    Requires GDAL. Raises :class:`~django.contrib.gis.geos.GEOSException` if

    GDAL is not available or if the SRID is ``None`` or less than 0.

    GDAL is not available or if the geometry's SRID is ``None`` or less than 0.

``Point``

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