Docs: clarify controller configuration and helm options

[tucktuck9]

We received feedback about this page, expressing the need to clarify the controller configuration options content and to direct users to the actual supported Helm chart options.

Issue

N/A

Description

• Update the description of the Controller configuration options page
• Add a clear link on the Controller configuration options page that directs users to the Helm chart values documentation for installation-specific configurations

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tucktuck9 / name: Leah Tucker (2eb462f)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @tucktuck9. Thanks for your PR.

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[zac-nixon]

/lgtm
Thank you!

[jarias-lfx]

/easycla

[tucktuck9]

@wweiwei-li @M00nF1sh Can we get a final review/approval on this please?