Add more details to Snapshot FAQ

[seemanthinibr]

Which topic are you reporting about?

https://cloud.ibm.com/docs/power-iaas?topic=power-iaas-snapshots-cloning#snap-clone-faqs

What do you think needs to be updated?

We often have customers enquiring on below details regarding snapshots.
It would be great if we add them to the frequently asked questions.

are there any restrictions on the number of snapshot retention generations, storage period, or capacity?
Also, if I restore from a snapshot, can I use the snapshot to restore again?

Anything else?

No response