Define geometry for event_location Point

[michael-danko-passport]

Here: https://github.com/openmobilityfoundation/curb-data-specification/tree/main/events#curb-event

We list out GeoJSON but do not specify which type of geometry this is. The GeoJSON spec standard can be found here but we need to know what to document into the OpenAPI. https://datatracker.ietf.org/doc/html/rfc7946

I'm assuming this is a GeoJSON point but want to flag this that the documentation I first linked to needs to be updated.

[schnuerle]

We give an example of a point here, and define an example of a polygon here, but yes in CDS events event_location we should say "GeoJSON Point" in the spec.

[schnuerle]

A Point example is now given here and can be linked to in 1.1 when Objects are done.

[schnuerle]

Flagging that this needs a quick PR.

[schnuerle]

Updated spec in #192 per this commit.