Typo in Docs [skip ci]

made querybuilder condition methods public

* 'master' of github.com:yiisoft/yii2:
  typo
  fixed extension list file location.
  doc fix.
  moved extension list under yiisoft. updated read me.
  updated license information.
  reorganized extension directories.
  Adjusted jui directories.
  moved mutex back from extensions.
  Changed the exit status to normal.
  Specify the exact type of the exception.
  Small typos
  PhpDoc comment
  Missing return statement
  Changed php-diff dependency to use code from master (they haven't tagged changes we need yet)
  Added ability to get all GET, POST, PUT, DELETE or PATCH parameters to Request
  Add batchInsert method to yii\db\Migration
  Fixes #1117: added support to map a single view directory to multiple themed view directories.
  Fixes #1116.

updated read me.

Typos

Missing return statement