[@types/react] ReactPortal extends ReactElement

[tenorok]

Portals types works normal when used in method render() of Class-Component. But, it have breaks when used in Functional-Component:

function PortalComponent(props: { root: HTMLElement }) {
    return ReactDOM.createPortal(
        <div/>,
        props.root
    );
}

function MyComponent() {
    const root = document.getElementById('#foo');
    if (!root) {
        return null;
    }

    return (
        // JSX element type 'ReactPortal' is not a constructor function for JSX elements.
        // Property 'render' is missing in type 'ReactPortal'.
        <PortalComponent root={root}/>
    );
}

Actually code is works fine.
Portal should extends from ReactElement similarly JSX.Element.

• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Add or edit tests to reflect the change. (Run with npm test.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).

If changing an existing definition:

• Provide a URL to documentation or source code which provides context for the suggested changes: https://reactjs.org/docs/portals.html
• Increase the version number in the header if appropriate.
• If you are making substantial changes, consider adding a tslint.json containing { "extends": "dtslint/dt.json" }.

[typescript-bot]

@tenorok Thank you for submitting this PR!

🔔 @johnnyreilly @bbenezech @pzavolinsky @digiguru @ericanderson @morcerf @tkrotoff @DovydasNavickas @onigoetz @theruther4d @guilhermehubner @ferdaber @jrakotoharisoa @pascaloliv @Hotell - please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

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[typescript-bot]

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[johnnyreilly]

Thanks!