replaced functional with function

[Biki-das]

Corrected a word in error message.

Related conversation : reactjs/react.dev#863

[sizebot]

Comparing: c0c71a8...31da1ca

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	129.68 kB	129.68 kB	=	41.46 kB	41.46 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	134.66 kB	134.66 kB	=	42.94 kB	42.94 kB
facebook-www/ReactDOM-prod.classic.js	=	424.11 kB	424.11 kB	=	78.18 kB	78.18 kB
facebook-www/ReactDOM-prod.modern.js	=	412.66 kB	412.66 kB	=	76.43 kB	76.43 kB
facebook-www/ReactDOMForked-prod.classic.js	=	424.11 kB	424.11 kB	=	78.18 kB	78.18 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 31da1ca

[gaearon]

Thanks but this file is generated. If the message exists in the source, please fix the source. If not, there's no point changing it.