Document proxy settings

[itay-ct]

Should be documented how to configure the proxy settings (specifically for the JAVA APM EDOT, but also in general)

[theletterf]

@alexandra5000 Assigning this one to you. For an example, see https://help.splunk.com/en/splunk-observability-cloud/administer/authentication-and-security/allow-splunk-observability-cloud-services-in-your-network#configure-proxy-settings-for-the-collector-0

[colleenmcginnis]

@theletterf can we leave this unassigned until we do our next round of sprint planning?

[theletterf]

Sure.