Review all of the documentations

[LaszloLango]

Before releasing the next major version of the engine we must review the documentations. They might be outdated.

• [x] CONTRIBUTING.md
  • No changes needed. Reviewed by @LaszloLango
• [ ] README.md
  • [ ] https://github.com/jerryscript-project/jerryscript/issues/5161
• [ ] 00.GETTING-STARTED.md
• [ ] 01.CONFIGURATION.md
• [ ] 02.API-REFERENCE.md

  • 5178

• [ ] 03.API-EXAMPLE.md
• [ ] 04.INTERNALS.md
• [ ] 05.PORT-API.md

  • 4977

• [ ] 06.REFERENCE-COUNTING.md
• [ ] 07.DEBUGGER.md
• [ ] 08.CODING-STANDARDS.md
• [ ] 09.EXT-REFERENCE-ARG.md
• [ ] 10.EXT-REFERENCE-HANDLER.md
• [ ] 11.EXT-REFERENCE-AUTORELEASE.md
• [ ] 12.EXT-REFERENCE-MODULE.md
• [ ] 13.DEBUGGER-TRANSPORT.md
• [ ] 14.EXT-REFERENCE-HANDLE-SCOPE.md
• [ ] 15.MODULE-SYSTEM.md
• [ ] 16.MIGRATION-GUIDE.md