message: docs: update specUrl
diff: @@ -162,7 +162,7 @@ Also you can pass options:
  ```js
  <RedocStandalone
  - specUrl="http://rebilly.github.io/RebillyAPI/openapi.json"
  + specUrl="https://api.redoc.ly/registry/rebilly/core-api/core/bundle/master/openapi.yaml"
  options={{
  nativeScrollbars: true,
  theme: { colors: { primary: { main: '#dd5522' } } },
  @@ -176,7 +176,7 @@ You can also specify `onLoaded` callback which will be called each time Redoc ha
  ```js
  <RedocStandalone
  - specUrl="http://rebilly.github.io/RebillyAPI/openapi.json"
  + specUrl="https://api.redoc.ly/registry/rebilly/core-api/core/bundle/master/openapi.yaml"
  onLoaded={error => {
  if (!error) {
  console.log('Yay!');
  