Revert "Document port6 and bind6 config options."
Revert "Document port6 and bind6 config options."

IPv6 support is not going to use IPv6 specific options, just it will be
possible to specify all the ipv4 / ipv6 addresses of the interfaces to
bind, otherwise connections will be accepted from all the interfaces in
both IPv4 and IPv6 addresses.

This reverts commit 93570e179e96dc096b85aa0fcd5021b05208594a.

JackieXie168/redis,JackieXie168/redis,JackieXie168/redis,JackieXie168/redis