Add examples of different geometry types

[duncandewhurst]

On a call with CoST West Lombok (notes in CRM-7083#note-15) they asked for examples of how to represent different geometry types in locations/geometry.

The worked example in the OC4IDS documentation contains only a Point geometry, so I showed the LineString example in the Location extension documentation, but this caused some confusion due to being nested under tender.

Since location data is important for infrastructure projects and since the GeoJSON docs don't provide examples, we should add examples of at least LineString and Polygon to the OC4IDS worked example.

[jpmckinney]

We might link to examples:

https://en.wikipedia.org/wiki/GeoJSON#Geometries
https://tools.ietf.org/html/rfc7946#section-1.5
https://docs.mongodb.com/manual/reference/geojson/