Update basics.md
Fixes
Update model.md
Merge pull request #3040 from MetalGuardian/update-model-md

Update model.md
Update module-debug.md
Merge pull request #3041 from MetalGuardian/update-module-debug-md

Update module-debug.md
Removed `Application::preload` in favor of `Application::bootstrap`
Merge pull request #3032 from arisk/patch-5

Update basics.md [skip ci]
updated phpdoc
renamed attributes to attributeNames in model

fixes #3034
Fixes #2034: Added `ContentNegotiator` to support response format and language negotiation
update class map.
added more doc [skip ci]
fixed broken API links [skip ci]
updated error handler and requirement checker links.