Update configuration documentation to include host (endpoint) configuration details

[jaffinito]

Feature Description

• Update configuration documentation to include using the "host" attribute on the "service" element.
• Include details on the corresponding environment variable
• Include detail that this is on for FEDRAMP accounts and how to set the option for FEDRAMP.
  • Please be very clear that this setting is not something customers need to mess with outside of that very specific scenario

Priority

Really Want

[workato-integration[bot]]

https://issues.newrelic.com/browse/NEWRELIC-3676

[angelatan2]

Hey team! Please add your planning poker estimate with Zenhub @jaffinito @JcolemanNR @tippmar-nr

[angelatan2]

Please add your planning poker estimate with Zenhub @nr-ahemsath

[nr-ahemsath]

This appears to have been done: https://docs.newrelic.com/docs/apm/agents/net-agent/configuration/net-agent-configuration/#service-host