This patch adds documentation for sysctl conf/all/disable_ipv6 and
conf/default/disable_ipv6 settings which is currently missing.
Signed-off-by: NPali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20210121150244.20483-1-pali@kernel.orgSigned-off-by: NJakub Kicinski <kuba@kernel.org>