edit to introduction, add new response codes section

[rydiaroads]

Proposed changes

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

Problem: Introduction is not written clearly.

Solution: Separated multiple lines into bullets and made small wording changes throughout

Testing: None

Please focus on (optional): If you any specific areas where you would like reviewers to focus their attention or provide
specific feedback, add them here.

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

Closes #ISSUE

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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
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• I have ensured that documentation content adheres to the style guide
• If the change involves potentially sensitive changes¹, I have assessed the possible impact
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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. ↩

[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
_{Posted by the CLA Assistant Lite bot.}

[rydiaroads]

I have hereby read the F5 CLA and agree to its terms

[mjang]

Thank you for improving things. If you could respond to my comments, I'll appreciate it

I'll be running an unconference feedback session 8:30 tomorrow (Tuesday)

[mjang]

Thanks so much for your contribution!