Note when vulnerability report option was added

What does this MR do?

Update Vulnerability Report documentation to note when the "Select multiple vulnerabilities and change their status" option was added to GitLab. I believe the associated MR was intended for 13.9 but only made it into 13.10, hence the change to the image's suffix.

Related issues

#292636 (closed)

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Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

When applicable:

• Update the permissions table.
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• Add GitLab's version history note(s).
• Add/update the feature flag section.

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