React page update

[mununki]

https://rescript-lang.org/docs/react/latest/introduction

Need to update v0.11.0 regarding JSX v4?

[ryyppy]

@mununki is this considered done now, or does it need more docs?

[mununki]

@mununki is this considered done now, or does it need more docs?

Sorry for missing notification. Yes, it is done now.