RFR: 8298090: Use String.join() instead of manual loop in DescriptorSupport.toString

[Sergey Tsypanov]

On Wed, 2 Nov 2022 21:30:51 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> There is opportunity to use String.join in DescriptorSupport.toString implementation. Result code is much shorter and clearer.

Marked as reviewed by stsypanov (Author).

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PR: https://git.openjdk.org/jdk/pull/10960