added a hint and link

Bulgarian translation

* 'master' of github.com:yiisoft/yii2: (79 commits)
  Refactored app bootstrap logic.
  Update authorization.md
  Fixes #3052: Fixed the issue that cache dependency data is not reused when `reusable` is set true
  start debug logging only if debug runs when bootstrap.
  Update finnish translation
  Add ODBC support to yii\db\Connection
  updated error handler and requirement checker links.
  fixed broken API links [skip ci]
  added more doc [skip ci]
  update class map.
  Fixes #2034: Added `ContentNegotiator` to support response format and language negotiation
  renamed attributes to attributeNames in model
  updated phpdoc
  Removed `Application::preload` in favor of `Application::bootstrap`
  Update module-debug.md
  Update model.md
  Fixes
  Update basics.md
  typo fix [skip ci]
  Added `HtmlResponseFormatter` and `JsonResponseFormatter`
  ...

issue #3026

Update authorization.md

RBAC Rule small fix

Add ODBC support to yii\db\Connection

Update finnish translation

Add wait() to login test with wrong credentials to fix WebDriver test

fixes #3034

Update basics.md [skip ci]

Update module-debug.md

Update model.md

addSelect method for Query

fixes #3028