[jdk21] RFR: 8309819: Clarify API note in Class::getName and MethodType::toMethodDescriptorString

[Mandy Chung]

On Sat, 1 Jul 2023 00:45:32 GMT, Chen Liang <liach at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [8c8e9d91](https://github.com/openjdk/jdk/commit/8c8e9d911d388f6ee621ed4d322efc56a9876708) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Chen Liang on 30 Jun 2023 and was reviewed by Mandy Chung.
> 
> The associated CSR https://bugs.openjdk.org/browse/JDK-8309823 has already been approved for release 21 as well.
> 
> Thanks!

Marked as reviewed by mchung (Reviewer).

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PR Review: https://git.openjdk.org/jdk21/pull/89#pullrequestreview-1508023111