Please improve the readme on webhooks

[doc-l]

It contains syntax errors:

app.use("/events", EventsHandler(events: []Event) => {

should be

app.use("/events", EventsHandler(events: Event[]) => {

and

app.use("/sign_transaction", SignTransactionHandler(req: SignTransactionRequest, resp: SignTransactionResponse) => {
    // decide whether or not to sign() or reject() the request.
}, secret),

has a missing ( right after SignTransactionHandler

[chaseeb]

was this resolved?

[doc-l]

no, the readme still contains those syntax errors