Catch up on documentation of Redmine vulnerabilities

PR: 205110
Security: CVE-2015-8346
Security: CVE-2015-8473
Security: CVE-2015-8474
Security: https://vuxml.FreeBSD.org/freebsd/21bc4d71-9ed8-11e5-8f5c-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/3ec2e0bc-9ed7-11e5-8f5c-002590263bf5.html
Security: https://vuxml.FreeBSD.org/freebsd/be63533c-9ed7-11e5-8f5c-002590263bf5.html