Avoid Gerund

[janetjotw]

Remove gerund from headings for Issue nginx#396.

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: Remove the gerund form from Titles and Headings.

Solution: Replaced the ing form with an imperative verb.

Testing: Did a preview of the page after editing.

Please focus on (optional): Wanted to try a page with a PR and then plan to do subsequent edits.

If this PR addresses an issue on GitHub, ensure that you link to it here:
nginx#396

Closes #ISSUE

Checklist

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• I have read the contributing guidelines
• I have signed the F5 Contributor License Agreement (CLA)
• I have rebased my branch onto main
• I have ensured my PR is targeting the main branch and pulling from my branch from my own fork
• I have ensured that the commit messages adhere to Conventional Commits
• I have ensured that documentation content adheres to the style guide
• If the change involves potentially sensitive changes¹, I have assessed the possible impact
• If applicable, I have added tests that prove my fix is effective or that my feature works
• I have ensured that existing tests pass after adding my changes
• If applicable, I have updated README.md and CHANGELOG.md

Footnotes

1. Potentially sensitive changes include anything involving code, personally identify information (PII), live URLs or significant amounts of new or revised documentation. Please refer to our style guide for guidance about placeholder content. ↩