RFR: 8250659: Clarify in ParameterizedType.getRawType() doc that only Class is returned

[Chen Liang]

On Mon, 1 Jul 2024 19:20:48 GMT, Chen Liang <liach at openjdk.org> wrote:

> Clarify that only `Class` is returned for core reflection implementation, and the return type is `Type` to support other implementations, such as ones modeling unloaded or remote types.

Keep-alive.

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PR Comment: https://git.openjdk.org/jdk/pull/19978#issuecomment-2257159982