_content/security/vulndb: add examples
_content/security/vulndb: add examples

Change-Id: Ic15fd13d9d7b61cfa2e768d6265ffc574bd0f5cf
Reviewed-on: https://go-review.googlesource.com/c/website/+/425374
Reviewed-by: Julie Qiu <e6cb64861edcc38971590ff27c111e0e672de045@google.com>
Run-TryBot: Julie Qiu <e6cb64861edcc38971590ff27c111e0e672de045@google.com>
Auto-Submit: Julie Qiu <e6cb64861edcc38971590ff27c111e0e672de045@google.com>
Reviewed-by: Damien Neil <7e091e9a80da888fcd7836fd3c6b7b85f4677c12@google.com>
Reviewed-by: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website