1. Fix PORTREVISION in master port emulators/virtualbox-ose-legacy for slave port emulators/virtualbox-ose-nox11-legacy.
2. Rename in slave port emulators/virtualbox-ose-nox11-legacy MANUAL to DOCS - in master port was removed in https://cgit.freebsd.org/ports/commit?id=a0ef5898beb4c6a73e9d94aaa452c0eb37cbb14c.
3. Bump emulators/virtualbox-ose-nox11-legacy.