Update false positive alert to have uniform text size

What does this MR do and why?

Update false positive have uniform text size

Ensure doc link text in the false positive vulnerability alert has the same text size.

Issue: #481961

Changelog: changed EE: true

References

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• Text change discussion: #481961 (comment 2182268569)

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Before	After

How to set up and validate locally

To create a false positive alert for a vulnerability:

Copy from !93605 (merged)

vuln = Vulnerability.find(<id>) # replace `<id>` with the ID of the vulnerability you want to mark as a false positive.
flag = Vulnerabilities::Flag.new(finding: vuln.finding, origin: "", description: "This is a false positive")
flag.save

Related to #481961