docs: auto generate pouch cli docs via code

Signed-off-by: pouchrobot <pouch-dev@list.alibaba-inc.com>

CONTRIBUTORS

@@ -8,6 +8,7 @@ Allen Sun <allensun.shl@alibaba.com>
 Allen Sun <shlallen1990@gmail.com>
 andy shi <szihai@gmail.com>
 chenchaobing <chaobing.ccb@alibaba-inc.com>
+fengzixu <hnustphoenix@gmail.com>
 garfield009 <1055471237@qq.com>
 Ggicci <ggicci@163.com>
 Jin Zhang <zj3142063@gmail.com>