modify for format

Signed-off-by: Nzhaolinglan <zhaolinglan@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-inputmethod-extension-context.md

@@ -48,7 +48,8 @@ startAbility(want: Want, callback: AsyncCallback<void>): void;
   ```js
     let want = {
         'bundleName': 'com.example.myapp',
-      'abilityName': 'MyAbility'};
+        'abilityName': 'MyAbility'
+    };
     this.context.startAbility(want, (err) => {
         console.log('startAbility result:' + JSON.stringify(err));
     });