Fix typos + better highlighting + details on some proposals

[sarupbanskota]

Proposal	PR	Label
Rest/Spread Properties	no	yes
Asynchronous Iteration	no	no
Dynamic Import	no	no
RegExp Unicode Property Escapes	no	no
RegExp Named Capture Groups	no	no
RegExp DotAll Flag	no	no
function.sent	no	no
Class Fields	yes	yes
Class and Property Decorators	yes	yes
BigInt	yes	yes
import.meta	yes	yes
export * as ns from "mod";	no	no
export v from "mod";	no	no
Generator Arrow Functions	no	no
Optional Chaining	no	no
do Expressions	no	no
Numeric Separator	yes	yes
Function Bind	no	no

[hzoo]

Thanks @sarupbanskota!