Document Wordpress vulnerabilities fixed in 4.5.3

PR: 210480 [1]
PR: 210581
Reported by: Mihail Timofeev <9267096@gmail.com> [1]
Security: CVE-2016-5832
Security: CVE-2016-5833
Security: CVE-2016-5834
Security: CVE-2016-5835
Security: CVE-2016-5836
Security: CVE-2016-5837
Security: CVE-2016-5838
Security: CVE-2016-5839
Security: https://vuxml.FreeBSD.org/freebsd/bfcc23b6-3b27-11e6-8e82-002590263bf5.html