Env Vars RFC is out of date

[echlebek]

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Component(s)

docs/rfcs

What happened?

Describe the bug The env vars rfc is out of date. (https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/rfcs/env-vars.md#current-behavior)

In https://github.com/open-telemetry/opentelemetry-collector/blob/main/CHANGELOG.md#v1110v01040, the syntax for environment variables was changed, but the documentation was seemingly not updated to reflect that. I did look for an issue regarding it but didn't find one.

Collector version

This applies to every version after and including v0.104.0