docs(core/state,core/vm): clarify Exist self-destruct semantics #31809

[gzliudan]

Proposed changes

Clarify that Exist returns true for self-destructed accounts only within the current transaction. Align the StateDB interface comment with the StateDB implementation comment.

Ref: ethereum#31809

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[Copilot]

Pull request overview

Clarifies the semantics of StateDB.Exist for self-destructed accounts, aligning the interface documentation (core/vm) with the concrete StateDB implementation (core/state) so readers understand the behavior is scoped to the current transaction.

Changes:

• Update StateDB.Exist doc comment to specify it returns true for self-destructed accounts only within the current transaction.
• Align the core/vm StateDB interface comment with the core/state StateDB implementation comment.
• Minor formatting/spacing adjustments in the interface for readability.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
core/vm/interface.go	Updates StateDB.Exist interface comment to clarify self-destruct “existence” is only within the current transaction (and adds spacing for readability).
core/state/statedb.go	Updates the StateDB.Exist implementation comment to match the clarified semantics.

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