Arthas jvm 命令教程 (#1329)

* add jvm command scenario. #847

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* add jvm scenario doc links. #847

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* fix links

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* switch to use arthas-demo

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* update to fit the latest situation

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* add examples to use jvm

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* update to fit the 3.3.7 situation

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>

* update to fit the 3.3.7

Signed-off-by: hollowman6 <hollowman186@vip.qq.com>