Document security issues fixed in PHP 7.0.7, 5.6.22, and 5.5.36

PR: 209779
Reported by: Fabiano Sidler <fabianosidler@swissonline.ch>
Security: CVE-2013-7456
Security: CVE-2016-4343
Security: CVE-2016-5093
Security: CVE-2016-5094
Security: CVE-2016-5096
Security: https://vuxml.FreeBSD.org/freebsd/6b110175-246d-11e6-8dd3-002590263bf5.html