doc: describe what security issues are
Fix https://github.com/nodejs/security-wg/issues/18
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc,security
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fix https://github.com/nodejs/security-wg/issues/18
doc,security