JavaDoc Update - Explicit callout of API URLs (i.e. deployments)

[sumo-drew]

We should update the JavaDoc referenced below to call out that we are defaulting to the US1 deployment of Sumo Logic and that the consumer of the SDK must update this to interact with any other deployments. We should also link to our docs showing the full list of deployments and their URLs - https://help.sumologic.com/APIs/General-API-Information/Sumo-Logic-Endpoints-by-Deployment-and-Firewall-Security

sumo-java-client/src/main/java/com/sumologic/client/SumoLogicClient.java

Line 71 in 12bcd7e

* Sets a custom Sumo Logic API url, i.e.,