fix broken link

[ryepup]

Proposed changes

Fix a broken link.

The old link redirected to https://docs.nginx.com/waf/, but we want to specifically link to the security logs.

Checklist

Before sharing this pull request, I completed the following checklist:

• I read the Contributing guidelines
• My branch adheres to the Git conventions
  • I don't think it does, but this is a tiny change via the "edit this page" feature
• My content changes adhere to the F5 Technical Writing Style Guide
• If my changes involve potentially sensitive information¹, I have assessed the possible impact
• I have waited to ensure my changes pass tests, and addressed any discovered issues

Footnotes

1. Potentially sensitive information includes personally identify information (PII), authentication credentials, and live URLs. Refer to the style guide for guidance about placeholder content. ↩

[github-actions]

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