Update article.md

Author: leviding

2-ui/5-loading/03-onload-onerror/article.md

@@ -169,7 +169,7 @@ There are three levels of cross-origin access:
 
 1. **No `crossorigin` attribute** -- access prohibited.
 2. **`crossorigin="anonymous"`** -- access allowed if the server responds with the header `Access-Control-Allow-Origin` with `*` or our origin. Browser does not send authorization information and cookies to remote server.
-3. **`crossorigin="use-credentials"`** -- access allowed if the server sends back the header `Access-Control-Allow-Origin` with our origin and `Access-Control-Allow-Credentials: true`.  Browser sends authorization information and cookies to remote server.
+3. **`crossorigin="use-credentials"`** -- access allowed if the server sends back the header `Access-Control-Allow-Origin` with our origin and `Access-Control-Allow-Credentials: true`. Browser sends authorization information and cookies to remote server.
 
 ```smart
 You can read more about cross-origin access in the chapter <info:fetch-crossorigin>. It describes the `fetch` method for network requests, but the policy is exactly the same.