Update outdated links in JavaDoc and documentation (mostly to php pages)

[HannesWell]

No description provided.

[github-actions]

Test Results

  170 files  ±0    170 suites  ±0   26m 36s ⏱️ - 1m 11s
4 679 tests ±0  4 658 ✅ ±0   21 💤 ±0  0 ❌ ±0 
6 592 runs  ±0  6 437 ✅ ±0  155 💤 ±0  0 ❌ ±0 

Results for commit 7c2d68b. ± Comparison against base commit d820f7e.

[github-actions]

Test Results (linux)

 52 files   -    36   52 suites   - 36   2s ⏱️ - 14m 2s
 26 tests  - 4 531   26 ✅  - 4 311  0 💤  - 220  0 ❌ ±0 
104 runs   - 3 171  104 ✅  - 3 102  0 💤  -  69  0 ❌ ±0 

Results for commit 408cc10. ± Comparison against base commit d820f7e.

This pull request removes 4531 tests.

org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_dollarSign
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_emptyString
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letterA
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicASCII_letters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16LE_null
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_AsciiLetters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_Asciiletter
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_LotsOfLetters
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letter
org.eclipse.swt.tests.gtk.Test_GtkConverter ‑ test_HeuristicUTF16_letters
…