check some error

Signed-off-by: Ngaoxiang <gaoxiang75@huawei.com>

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

@@ -94,7 +94,7 @@ switchInputMethod(target: InputmethodProperty, callback: AsyncCallback<boolea
      prompt.showToast({message:"切换输入法成功" + this.imeList[this.flag].packageName, duration: 200});
  });
 ```
-
+## inputMethod.switchInputMethod<sup>9+</sup>
 switchInputMethod(target: InputmethodProperty): Promise&lt;boolean&gt;