8337056: [lworld] Document APIs that require Identity objects as parameters

[liach]

The original RFE proposes to document where IdentityException would now be thrown. In the JDK, only the Cleaner constructor is missing this specification. I also shifted the identity check to method entry; before it was done in the superclass constructors.

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• JDK-8337056: [lworld] Document APIs that require Identity objects as parameters (Enhancement - P4)

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