Clarify how passivation works for both shared and unshared stores

This came out of a customer case. The docs need to be updated to include the following:

Activation of passivated entries with a shared store will not remove entries from the store

Upstream docs have been fixed with ISPN-8193

https://github.com/infinispan/infinispan/pull/5373/files

In particular this Note

"NOTE: Entries which have been activated, i.e. brought back from the store to memory, will still continue to exist in
the cache store if this has been configured as `shared`. This happens because backup owners might still need to access it."

A new table was added that shows the status of a key with passivation off, on and shared, and on and not shared.

JDG docs have two tables, one for passivation on and one for off but no mention of shared or the crucial information in the NOTE from above:

https://access.redhat.com/documentation/en-us/red_hat_jboss_data_grid/7.1/html-single/administration_and_configuration_guide/#set_up_passivation

This JIRA is to update the JDG docs based on the upstream Infinispan docs.