Hello Surendra
In this particular case, we are looking at the ASA’s routing capabilities. The statement is saying that you can create up to three static routes to the same destination with a different next-hop IP. You can have multiple next-hop IPs that are reachable from the same interface, assuming you have multiple routers connected to the network of a particular interface of the ASA.
The result will be Equal-Cost Multi-Path routing to that destination. But ECMP is not achievable across multiple interfaces, it can only be achieved via a single interface.
An example of multiple equal-cost static routes, taken from the document you shared in your post, can be seen below:
ciscoasa(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.1
ciscoasa(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.2
ciscoasa(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.3
Notice how all next-hop IPs are on the same subnet and are reachable via the outside interface.
I hope this has been helpful!
Laz