docs: update sensor models and pointcloud types

[mojomex]

PR Type

• Improvement

Description

Pointcloud types were not up-to-date anymore and SRR520 was missing. Also renamed PandarE4X to OT128 in the docs.
Added a reference to the supported sensors page on the usage page for an easier getting-started experience.

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[drwnz]

Some suggested wording changes, expecting that it is assumed the fields are referring to a (singular) point.

[drwnz]

LGTM!