update docs

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-system-fetch.md

@@ -16,47 +16,15 @@ import fetch from '@system.fetch';
 
 ## fetch.fetch<sup>3+</sup>
 
-fetch(options:{
-    /**
-     * Resource URL.
-     * @since 3
-     */
-    url: string;
-    /**
-     * Request parameter, which can be of the string type or a JSON object.
-     * @since 3
-     */
-    data?: string | object;
-    /**
-     * Request header, which accommodates all attributes of the request.
-     * @since 3
-     */
-    header?: Object;
-    /**
-     * Request methods available: OPTIONS, GET, HEAD, POST, PUT, DELETE and TRACE. The default value is GET.
-     * @since 3
-     */
-    method?: string;
-    /**
-     * The return type can be text, or JSON. By default, the return type is determined based on Content-Type in the header returned by the server.
-     * @since 3
-     */
-    responseType?: string;
-    /**
-     * Called when the network data is obtained successfully.
-     * @since 3
-     */
-    success?: (data: FetchResponse) => void;
-    /**
-     * Called when the network data fails to be obtained.
-     * @since 3
-     */
-    fail?: (data: any, code: number) => void;
-    /**
-     * Called when the execution is completed.
-     * @since 3
-     */
-    complete?: () => void;
+fetch(options:{ <br>
+&nbsp;&nbsp;url: string;<br>
+&nbsp;&nbsp;data?: string | object;<br>
+&nbsp;&nbsp;header?: Object;<br>
+&nbsp;&nbsp;method?: string;<br>
+&nbsp;&nbsp;responseType?: string;<br>
+&nbsp;&nbsp;success?: (data: FetchResponse) => void;<br>
+&nbsp;&nbsp;fail?: (data: any, code: number) => void;<br>
+&nbsp;&nbsp;complete?: () => void;<br>
   } ): void
 
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