doc memory stress examples may be some errors

[dingbb]

root@ubuntu:~# chaosd attack stress mem --workers 2 --size 2000M
Error: unknown flag: --workers
Usage:
chaosd attack stress mem [options] [flags]

Flags:
-h, --help help for mem
-o, --options strings extend stress-ng options.
-s, --size string Size specifies N bytes consumed per vm worker, default is the total available memory. One can specify the size as % of total available memory or in units of B, KB/KiB, MB/MiB, GB/GiB, TB/TiB..

Global Flags:
--log-level string the log level of chaosd. The value can be 'debug', 'info', 'warn' and 'error'
--uid string the experiment ID

Error: unknown flag: --workers

memory stress test no parameters is not --workers , Do the doc examples need to be repaired ?

https://chaos-mesh.org/zh/docs/simulate-heavy-stress-in-physical-nodes/