Merge branch 'mongodb-debug-short' of github.com:klimov-paul/yii2 into klimov-paul-mongodb-debug-short

Small fix [skip ci]

little typo

[ci skip] Added docs/guide-ja/README.md

Fixes #5528: added auto_reload to default twig config in both extension readme and template engines chapter in docs

[skip ci] Typo in the english version

[skip ci] couple small corrections

before: failed with undefined index PHP error
now: fail with proper error complaining about missing argument.

[skip ci] Fixed typo

Fix typos in configurations guide

[skip ci] Fixed typos in properties guide

[ci skip] Update tutorial-mailing.md

[skip ci] Remove stability=dev

Shouldn't stability=dev be removed?

ensure syntax highlighting

Revert "Update output-data-widgets.md"