[jfx17u] RFR: 8286774: Replace openjdk.java.net with openjdk.org

[Kevin Rushforth]

Backport fix to substitute openjdk.java.net with openjdk.org. Most of the patch applied cleanly, but there were a few files modified in mainline that don't exist in jfx17u (so excluded from backport). Additionally, I had to manually update the following:


CONTRIBUTING.md
README.md
doc-files/release-notes-17.0.1.md
doc-files/release-notes-17.0.2.md

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Commit messages:
 - 8286774: Replace openjdk.java.net with openjdk.org

Changes: https://git.openjdk.org/jfx17u/pull/80/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=80&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8286774
  Stats: 570 lines in 31 files changed: 0 ins; 0 del; 570 mod
  Patch: https://git.openjdk.org/jfx17u/pull/80.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/80/head:pull/80

PR: https://git.openjdk.org/jfx17u/pull/80