[cli] update cli doc (#5729)
[cli] update cli doc (#5729)

`s` in mode has been deprecated.
jwhui/openthread,abtink/openthread,bukepo/openthread,srickardti/openthread,srickardti/openthread,bukepo/openthread,chshu/openthread,jwhui/openthread,jwhui/openthread,abtink/openthread,jwhui/openthread,chshu/openthread,bukepo/openthread,chshu/openthread,srickardti/openthread,openthread/openthread,chshu/openthread,srickardti/openthread,chshu/openthread,abtink/openthread,openthread/openthread,openthread/openthread,openthread/openthread,bukepo/openthread,chshu/openthread,abtink/openthread