Update input-validation.md

Minor syntax changes.
Merge pull request #6286 from cdvrooman/patch-28

[skip ci] Update input-validation.md
Update input-file-upload.md

Minor syntax changes.
Merge pull request #6287 from cdvrooman/patch-29

[skip ci] Update input-file-upload.md
Update output-formatter.md

MInor syntax changes.
Fixes #5480: Added defensive code to `yii\web\User::getIdentity()` to avoid potential infinite recursion
Fixed doc [skip ci]
adjusted missing return for fix #6263
docs/guide-ja/README.md - revised using "初期設定" and "設定情報" for "configuration(s)" [ci skip]
docs/guide-ja/intro-yii.md - revised avoiding ":" in the translation [ci skip]
docs/guide-ja/intro-upgrade-from-v1.md - revised using "初期設定" and "設定情報" for "configuration(s)" [ci skip]
docs/guide-ja/images - "config" => "構成" [ci skip]
docs/guide-ja/README.md - "config" => "構成" [ci skip]
docs/guide-ja/intro-upgrade-from-v1.md - "config" => "構成" [ci skip]
docs/guide-ja/intro-upgrade-from-v1.md - updated [ci skip]
docs/guide-ja/start-workflow.md - revised [ci skip]
docs/guide-ja/start-installation.md - revised [ci skip]
docs/guide-ja/start-hello.md - revised [ci skip]
docs/guide-ja/start-forms.md - revised [ci skip]
docs/guide-ja/start-forms.md - small changes [ci skip]