RFR: 8288450: Update attribution in gstreamer.md file [v3]

[Kevin Rushforth]

On Thu, 21 Jul 2022 21:54:23 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> is this information copied directly from the corresponding source projects?

Yes.

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PR: https://git.openjdk.org/jfx/pull/807