[doc] Document "queue_if_no_path" behavior
[doc] Document "queue_if_no_path" behavior

Document the queue_if_no_path behavior in situations where
all the paths to the LUN go offline.

gebi/multipath-tools,vijaychauhan/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,unakatsuo/multipath-tools,grzn/multipath-tools-explained,grzn/multipath-tools-explained,unakatsuo/multipath-tools