src.conf.5: Regen after ZFS-related options changes

Since 9503d2704ca6 LOADER_ZFS gets turned off when ZFS is, and since
63715498ac6b ZFS is no longer disabled on powerpc and powerpcspe.

Reviewed by: emaste
Fixes: 9503d2704ca6 ("opts: Minor cleanup of ZFS options")
Fixes: 63715498ac6b ("powerpc: enable ZFS on 32 bit powerpc/powerpcspe")
Differential Revision: https://reviews.freebsd.org/D39071