`Unregister-SecretVault -Name` should be of type `string[]` instead of `string`

[daxian-dbw]

Unregister-SecretVault should allow removing multiple vaults at once.

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[SydneyhSmith]

@daxian-dbw I am curious what the use case would be for unregistering multiple vaults at a time...what were you hitting when you wanted this feature?

[daxian-dbw]

I was playing the module and registered multiple vaults using Register-SecretVault, and then I'm done trying things and try to remove all. Then I found I had to remove one at a time.

[PaulHigin]

Implemented in preview6.