Docs: Annotate ModuleTemp fields as double in proto

[JuanPS999]

DescriptionAdded clarification comments to ModuleTempMin (ID 31) and ModuleTempMax (ID 29) in protos/vehicle_data.proto.

As reported in the related issue, the official documentation lists these fields as Integer, but actual telemetry data from vehicles returns double (floating point) values. This update documents the discrepancy directly in the source of truth to assist developers integrating with the API.

Fixes #428

Type of change:

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Checklist:

• My code follows the style of this project.
• I have performed a self-review of my code.
• I have made corresponding updates to the documentation.
• I have added/updated unit tests to cover my changes.
• I have added/updated integration tests to cover my changes.

[Bre77]

Can confirm, these values are in 0.5 increments. I've updated my records to reflect this so thanks @JuanPS999