[Basic] Provide some docs on memo

[silverwind]

What cheatsheet is this about? (if applicable)

Basic cheatsheet

What's your issue or idea?

Some docs on memo would be useful.

For example it took me a while to understand that such a combination of memo and forwardRef is wrong (the resulting type would not include ref):

const Div = memo<Props>(forwardRef<HTMLDivElement, Props>(function Div(props, ref) => {
  return <div ref={ref}/>;
}));

The correct way is to omit <Props> on memo if there is forwardRef inside it, so my suggestions are:

const Div = memo(forwardRef<HTMLDivElement, Props>(function Div((props, ref) => {
  return <div ref={ref}/>;
}));

const Div = memo<Props>(function Div(props => {
  return <div/>;
});

[filiptammergard]

Sounds like it could be useful. Feel free to contribute!