Endpoint includes port number

[joshkauffman]

In the "Initiating dfuse Graphql Server connection" section found here: https://github.com/dfuse-io/docs/blob/master/content/guides/eosio/tutorials/push-notifications.md It says that endpoints can be found on the endpoints page. However, the listed endpoints don't include a port, but this one does. Should be consistent (but I'm not sure which it should be always)