The major change is the description of options, change
it as the latest cli help message shows, which specify
a "value" after an option if it takes value, and add
(default: xxx) if the option has a default value.
This also includes some other minor consistency fixes.
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
--no-subreaper's description exist in code but not in manual:
# ./runc exec --help
...
OPTIONS:
...
--no-subreaper disable the use of the subreaper used to reap reparented processes
#
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>