docs: Update docs to reflect actual proxy sidecar behavior

[FineTralfazz]

Reason for Change:
The docs claim that the IMDS proxy sidecar is injected by default. That isn't true. There's also a test validating that behavior, so I don't think it's a code mistake, but a documentation one.

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable).

Issue Fixed:
N/A

Please answer the following questions with yes/no:

Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?

• yes
• no

[aramase]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.