Document how to set JVM arguments for different application servers when used with automatic instrumentation

[cartermp]

As per here https://github.com/open-telemetry/opentelemetry-java-docs/pull/4#discussion_r766225263 this is something that new users can struggle with.

There is a little prior art here:

• https://github.com/signalfx/splunk-otel-java/blob/main/docs/server-instructions.md
• https://docs.microsoft.com/en-us/azure/azure-monitor/app/java-standalone-arguments

This kind of configuration ought to live in opentelemetry docs as well.