Clarify how to customize the Bitbucket Server parameters (e.g. JVM_SUPPORT_RECOMMENDED_ARGS) in all conditions

Problem Definition

Depending on the Operating System and the method for starting Bitbucket Server, additional parameters may be set up in a different way (e.g. environment variable, startup script).

Suggested Solution

Confirm and document when each configuration can be used and the impact on upgrades (i.e. their persistence when upgrading).