[jfx22u] Integrated: 8304008: Update README.md and CONTRIBUTING.md for jfx update repos

[Kevin Rushforth]

On Fri, 12 Jan 2024 00:00:43 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Backport the changes to the README and CONTTRIBUTING guidelines for update releases. There are two commits: the first is a clean backport of the fix that went into jfx21u. The second is a simple substitution changing 21 to 22 in the two files.

This pull request has now been integrated.

Changeset: 632792d4
Author:    Kevin Rushforth <kcr at openjdk.org>
URL:       https://git.openjdk.org/jfx22u/commit/632792d4e7a6399c156df99b1cf69faba476a8c6
Stats:     267 lines in 2 files changed: 1 ins; 254 del; 12 mod

8304008: Update README.md and CONTRIBUTING.md for jfx update repos

Reviewed-by: jvos
Backport-of: d689dc12751660c14e558c37e82f8dc71d9a8037

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PR: https://git.openjdk.org/jfx22u/pull/2