!20725 fix some problem

Merge pull request !20725 from shegangbin/vulkan_guideline_fix_comment

zh-cn/application-dev/napi/vulkan-guidelines.md

@@ -42,16 +42,16 @@ Vulkan是一套用来做2D和3D渲染的图形应用程序接口，其中创建V
 
     std::vector<const char*> instanceExtensions = {
         VK_KHR_SURFACE_EXTENSION_NAME,
-        VK_OHOS_SURFACE_EXTENSION_NAME
+        VK_OHOS_SURFACE_EXTENSION_NAME // OpenHarmony平台的Surface扩展
     };
-    instanceCreateInfo.enabledExtensionCount = (uint32_t)instanceExtensions.size();
+    instanceCreateInfo.enabledExtensionCount = static_cast<uint32_t>(instanceExtensions.size());
     instanceCreateInfo.ppEnabledExtensionNames = instanceExtensions.data();
 
     vkCreateInstance(&instanceCreateInfo, nullptr, &instance);
     ```
 
 2. **获取OHNativeWindow**。
-    OHNativeWindow需要从XComponent组件中获取，下面提供一份从XComponent组件中获取OHNativeWindow的代码示例，具体XComponent模块接口的使用请参考XComponent模块的开发指导。
+    OHNativeWindow需要从XComponent组件中获取，下面提供一份从XComponent组件中获取OHNativeWindow的代码示例，XComponent模块的具体使用方法请参考[XComponent模块的介绍文档](../ui/arkts-common-components-xcomponent.md)和[XComponent开发指导](xcomponent-guidelines.md)。
     1. ets/pages/Index.ets中增加一个XComponent组件
     ```ts
     XComponent({
@@ -100,9 +100,10 @@ Vulkan是一套用来做2D和3D渲染的图形应用程序接口，其中创建V
 
 3. **创建VkSurfaceKHR对象**。
     ```c++
+    VkSurfaceKHR surface = VK_NULL_HANDLE;
     VkSurfaceCreateInfoOHOS surfaceCreateInfo = {};
     surfaceCreateInfo.sType = VK_STRUCTURE_TYPE_SURFACE_CREATE_INFO_OHOS;
-	surfaceCreateInfo.window = nativeWindow;
+    surfaceCreateInfo.window = nativeWindow; // 这里的nativeWindow就是从上一步骤OnSurfaceCreatedCB回调函数中拿到的
     int err = vkCreateSurfaceOHOS(instance, &surfaceCreateInfo, NULL, &surface);
     if (err != VK_SUCCESS) {
         std::cout << "Could not create surface!" << std::endl;