docs: add tip about harmless vulnerabilities

[ilg-ul]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.

Motivation

Attempt to minimise support requests asking if the reported npm install vulnerabilities are harmful.

Feel free to adjust the message if necessary.

Related issues/PRs

• npm reports 20 vulnerabilities (3 moderate, 17 high) #10525 (comment)

[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

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/	🟠 85	🟢 98	🟢 96	🟢 100	Report
/docs/installation	🟠 59	🟢 97	🟢 100	🟢 100	Report
/docs/category/getting-started	🟠 74	🟢 100	🟢 100	🟠 86	Report
/blog	🟠 62	🟢 96	🟢 96	🟠 86	Report
/blog/preparing-your-site-for-docusaurus-v3	🔴 47	🟢 92	🟢 100	🟢 100	Report
/blog/tags/release	🟠 63	🟢 96	🟢 96	🟠 86	Report
/blog/tags	🟠 74	🟢 100	🟢 100	🟠 86	Report

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[ilg-ul]

Any idea what might be wrong with the failed test?

[Josh-Cena]

No idea, but definitely not caused by this PR. I don't think I can trigger a rebuild so I'll wait for @slorber.

[slorber]

Netlify fails randomly lately for unknown reasons. You can trigger it again with an empty commit and it should work.

[ilg-ul]

... empty commit and it should work.

indeed.

[ilg-ul]

Thank you!