docs(filter vulnerabilities): fix link

[DmitriyLewen]

Description

fixed link to helper functions.

Related issues

• Rego policy  #1876

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[zestful-thud]

Any chance you can hold off on merging until #1756 is merged, so I don't have to rebase and wait for it's to be reviewed and tested all over again (been waiting a while to get this merged) 🙏