docs: pipeline: outputs: forward: note shared_key requirement for credentials

[eschabell]

Document that username and password require shared_key or empty_shared_key to be configured. Credentials are exchanged only during the secure forward handshake, and Fluent Bit now fails to start if they are set without a shared key.

Note this update due to code change without matching docs PR.

Summary by CodeRabbit

• Documentation
  • Clarified the Secure Forward configuration reference for username and password.
  • Added guidance that these values require shared_key or empty_shared_key to be set for the secure forward handshake.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 97cea373-c839-4be4-b259-16e654a16923

📥 Commits

Reviewing files that changed from the base of the PR and between 8892466 and c9e6ad8.

📒 Files selected for processing (1)

• pipeline/outputs/forward.md

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📝 Walkthrough

Walkthrough

Documentation update to the Secure Forward configuration parameter table in pipeline/outputs/forward.md, revising the username and password entries to note that they require shared_key or empty_shared_key to be set, since credentials are exchanged only during the secure forward handshake.

Changes

Forward Output Documentation

Layer / File(s)	Summary
Username/password requirement clarification pipeline/outputs/forward.md	Updated table rows for username and password to state the requirement of shared_key or empty_shared_key for handshake-based credential exchange.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• fluent/fluent-bit-docs#2230: Both PRs update Forward secure-forward authentication documentation to clarify how user credentials relate to shared_key/empty_shared_key.

Suggested reviewers: alexakreizinger

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the docs change about requiring shared_key for forward credentials.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[eschabell]

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[eschabell]

@patrick-stephens ready for review!