* Update Ref API in docs
Update to new React.createRef() API in guide "Uncontrolled Components".
* Update Ref API in doc example
Use new Ref API in guide's example.
* Fix syntax error in example
* Update highlighting ranges in docs
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
Remove empty line in source code.
* Update uncontrolled-components.md
* Update input-type-file.js