Update learn more link and docs formatting

What does this MR do and why?

1. Update the "Learn more" link to point to
   • Docs: https://docs.gitlab.com/ee/user/application_security/vulnerabilities/index.html#limitations-of-vulnerability-resolution
2. Remove the extra spacing in the docs

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Before	After
	https://docs.gitlab.com/ee/user/application_security/vulnerabilities/index.html#limitations-of-vulnerability-resolution

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #479184 (closed)