modify hdf document

Signed-off-by: Nzhang <zhangfengxi@huawei.com>

zh-cn/device-dev/driver/driver-hdf-development.md

@@ -99,27 +99,28 @@ HDF框架以组件化的驱动模型作为核心设计思路，为开发者提
        ```
        import("//build/lite/config/component/lite_component.gni")
        import("//drivers/adapter/khdf/liteos/hdf.gni")
-       module_switch = defined(LOSCFG_DRIVERS_HDF_PLATFORM)
+       module_switch = defined(LOSCFG_DRIVERS_HDF_xxx)
        module_name = "xxx"
        hdf_driver(module_name) {
-              sources = [
-                  "xxx/xxx/xxx.c",
-              ]
-              public_configs = [ ":public" ] --添加依赖头文件
+           sources = [
+               "xxx/xxx/xxx.c", #模块要编译的源码文件
+           ]
+           public_configs = [ ":public" ] #使用依赖的头文件配置
        }
-       config("public") {  --定义依赖的头文件
-              include_dirs = [
-              ]
+       config("public") {  #定义依赖的头文件配置
+           include_dirs = [
+		   "xxx/xxx/xxx", #依赖的头文件目录
+           ]
        }
        ```
 
-       把新增的BUILD.gn所在的目录添加到/drivers/adapter/khdf/liteos/BUILD.gn里面：
+       把新增模块的BUILD.gn所在的目录添加到/drivers/adapter/khdf/liteos/BUILD.gn里面：
 
        ```
        group("liteos") {
               public_deps = [ ":$module_name" ]
                   deps = [
-                     "xxx/xxx",   --新增的BUILD.gn所在的目录
+                     "xxx/xxx",   #新增模块BUILD.gn所在的目录，目录结构相对于/drivers/adapter/khdf/liteos
                  ]
        }
        ```