Update CONTRIBUTING.md

[pelesh]

Description

Remove style guidelines for enums because we are already making exceptions for enums entering the JSON parser.

@superwhiskers

Proposed changes

For now, just remove style guidelines for enums.

Checklist

N/A

[PhilipFackler]

I'm surprised you're removing the guideline altogether. I would think we would want enum value formatting to be consistent across the project, even if the style should be different from what this section says.

[pelesh]

I'm surprised you're removing the guideline altogether. I would think we would want enum value formatting to be consistent across the project, even if the style should be different from what this section says.

Updated guidelines for enums.