docs: piepline: outputs: loki: document parameters for oauth2 configuration

[umarhussain15]

Update documentation for the new oauth parameters added to loki output plugin

Implementation PR: fluent/fluent-bit#12401

Summary by CodeRabbit

• Documentation
  • Reformatted the Loki configuration parameter table for improved readability.
  • Added documentation for OAuth 2.0 configuration options, including authentication, credentials, token handling, timeouts, scopes, resources, and user-agent settings.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 0c7c6269-a942-48b4-9f5d-dc1caaa36df6

📥 Commits

Reviewing files that changed from the base of the PR and between 1e9af35 and 162a21b.

📒 Files selected for processing (1)

• pipeline/outputs/loki.md

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📝 Walkthrough

Walkthrough

The Loki configuration table was reformatted and expanded with documented OAuth2 options for authentication, JWT assertions, token handling, refresh behavior, timeouts, and request metadata.

Changes

Loki OAuth2 documentation

Layer / File(s)	Summary
OAuth2 configuration reference pipeline/outputs/loki.md	The Loki configuration table now documents OAuth2 client authentication, JWT settings, token requests, refresh behavior, timeouts, resource and scope values, token URL, and user-agent configuration.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to c12e9

This documentation-only change introduces no runtime or deployment risk.

🚥 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 identifies the Loki output documentation update for OAuth2 configuration. It contains a minor typo in "piepline," but the intended scope remains clear.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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