[Doc] fp64 extension

[just-website]

Link

https://deck.gl/docs/api-reference/extensions/fp64-extension#layer-properties

Description

For enable fp64 it is tell that the layer prop needs to be set to COORDINATE_SYSTEM.LNGLAT_DEPRECATED, but there is no such value in the COORDINATE_SYSTEM enum.

How to enable fp64 function in deck.gl ver. 9?

[Pessimistress]

The default projection already has 64-bit precision as of deck.gl 7+. No additional setting is needed.

The Fp64Extension has been deprecated. We should update the docs to make this clear.