Although page provides example usage of the listShards command, it doesn't provide any details on what is actually returned. It merely states that the command "returns a list of shards." What does a shard look like, in the context of the command?
It would be helpful to see some example output like what's on this page: https://docs.mongodb.com/manual/reference/command/isdbgrid/#dbcmd.isdbgrid
Here's the output of the command on my local machine. Three shards, each a standalone mongod: