Review all of the documentations

[LaszloLango]

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 They might be outdated.

• CONTRIBUTING.md
  • No changes needed. Reviewed by @LaszloLango
• README.md
  • Freenode? - IRC what you did #5161
  • Update the README.md for release 3.0 #5200
• 00.GETTING-STARTED.md
  • Updated the "Getting Started" and "Migration Guide" for the 3.0 release #5202
• 01.CONFIGURATION.md
  • Add missing configuration information to CONFIGURATION.md #5183
• 02.API-REFERENCE.md
  • Update the API documentation #5178
• 03.API-EXAMPLE.md
  • No changes needed. Reviewed by @LaszloLango
• 04.INTERNALS.md
  • No changes needed. Reviewed by @LaszloLango and @zherczeg
• 05.PORT-API.md
  • Improve the jerry port api documents. #4977
• 06.REFERENCE-COUNTING.md
  • No changes needed. Reviewed by @LaszloLango
• 07.DEBUGGER.md
  • Fix some style issues in debugger documentation #5181
• 08.CODING-STANDARDS.md
  • No changes needed. Reviewed by @LaszloLango
• 09.EXT-REFERENCE-ARG.md
  • Update and fix some issues in EXT-REFERENCE documentation #5180
• 10.EXT-REFERENCE-HANDLER.md
  • Update and fix some issues in EXT-REFERENCE documentation #5180
• 11.EXT-REFERENCE-AUTORELEASE.md
  • No changes needed. Reviewed by @gergocs
• 12.EXT-REFERENCE-MODULE.md
  • Update and fix some issues in EXT-REFERENCE documentation #5180
• 13.DEBUGGER-TRANSPORT.md
  • Fix some style issues in debugger documentation #5181
• 14.EXT-REFERENCE-HANDLE-SCOPE.md
  • No changes needed. Reviewed by @LaszloLango
• 15.MODULE-SYSTEM.md
  • No changes needed. Reviewed by @LaszloLango
• 16.MIGRATION-GUIDE.md
  • Updated the "Getting Started" and "Migration Guide" for the 3.0 release #5202