Document bundled JDK path for rpms and debs #45150
Description
Describe the feature:
At https://www.elastic.co/guide/en/elasticsearch/reference/current/rpm.html#rpm-layout and https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html#deb-layout we describe a lot of the paths that we make use of. However, there's a new path that may be of interest to a user: the bundled JDK path. While that path it's somewhat of an internal implementation detail, several of these paths are and it could be useful for a user that's reading through our documentation to see this path (and also be able to see the JDK is actually installed)