Character restrictions aren't listed out for vault creation

[lnajdekKong]

Where is the problem?

https://docs.konghq.com/gateway/latest/kong-enterprise/secrets-management/backends/env/

What happened?

There are no character restrictions listed when trying to create a vault.
For example - When you try to create a vault that contains a "_" in the prefix, this is restricted and won't be allowed to create.

schema violation (prefix: invalid value: testing_vaults)

What did you expect to happen?

Can we add the schema requirements to the docs page to avoid complications when creating a vault entity.

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