Update links and punctuation on Vulnerability Management Overview.

Brian Sextonrequested to merge
update-links-and-punctuation-vmo into master

This makes a few changes to https://about.gitlab.com/handbook/engineering/security/vulnerability_management/:

  • It unlinks "regular cadences", which was linked to nothing.
  • It makes absolute same-site links root-relative.
  • It adds a missing period.

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