[jfx17u] RFR: 8291630: Update attribution in webkit.md file

[Kevin Rushforth]

On Thu, 1 Sep 2022 14:47:17 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This is an effectively clean backport. The only difference is that one of the lines removed by the patch (removed both in jfx mainline and here) had been modified in jfx mainline to update the copyright year (modified incorrectly, as it turns out, but that's no longer relevant since the line has been removed).
> 
> The net result is that the `webkit.md` file is identical between mainline and jfx17u.

Reviewer: @arapte

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PR: https://git.openjdk.org/jfx17u/pull/82