doc: add global config victorops_api_key description

[nutmos]

Pull Request Checklist

Please check all the applicable boxes.

• Please list all open issue(s) discussed with maintainers related to this change
  • Fixes #
• Is this a new Receiver integration?
  • I have already tried to use the Webhook Receiver Integration and 3rd party integrations before adding this new Receiver Integration
• Is this a bugfix?
  • I have added tests that can reproduce the bug which pass with this bugfix applied
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  • My changes do not break the existing cluster messages
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Which user-facing changes does this PR introduce?

Add description for victorops_api_key and victorops_api_key_file in global config

Summary by CodeRabbit

• Documentation
  • Clarified VictorOps integration credential configuration options, documenting two mutually exclusive methods for specifying API credentials.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated the VictorOps integration configuration documentation to clarify two mutually exclusive credential options: victorops_api_key for direct API key specification and victorops_api_key_file for reading the API key from a file path.

Changes

Cohort / File(s)	Summary
VictorOps Configuration Documentation docs/configuration.md	Added clarification for two mutually exclusive credential configuration options for VictorOps integration with explicit comments documenting the exclusivity relationship.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• TheMeier
• SoloJacobs

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding documentation for the victorops_api_key configuration option in the global config section.
Description check	✅ Passed	The PR description follows the repository template with completed checklist items and includes release notes indicating documentation updates.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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