RFR: 8270490: Charset.forName() taking fallback default value [v2]

[Joe Wang]

On Wed, 20 Oct 2021 19:02:30 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> During the review of JEP 400, a proposal to provide an overloaded method to `Charset.forName()` was suggested [[1]](https://github.com/openjdk/jdk/pull/4733#discussion_r669693954). This PR is to implement the proposal. A CSR is also drafted as https://bugs.openjdk.java.net/browse/JDK-8275348
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Moved the null sentence into @param tag.

Marked as reviewed by joehw (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6045