docs: enhance known vulnerabilities page

[valentijnscholten]

Add some more info to help users understand the vulnerability analysis process.

[owasp-dt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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