update docs

Signed-off-by: NAnnie_wang <annie.wangli@huawei.com>

en/device-dev/subsystems/subsys-build-component.md

@@ -47,7 +47,9 @@ The **bundle.json** file of a component is stored in the root directory of the c
  }
 ```
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br>Existing components on the LiteOS are configured in the JSON file of the corresponding subsystem in the **build/lite/components** directory. The directory is named in the **{Domain}/{Subsystem}/{Component}** format. The component directory structure is as follows:
+> **CAUTION**
+>
+> Existing components on the LiteOS are configured in the JSON file of the corresponding subsystem in the **build/lite/components** directory. The directory is named in the **{Domain}/{Subsystem}/{Component}** format. The component directory structure is as follows:
 
 ```shell
 component
@@ -134,14 +136,47 @@ When adding a component, you must add the component definition to the JSON file
    ```shell
    ohos_prebuilt_etc("feature3_etc") {
      source = "src/config.conf"
-     relative_install_dir = "init"    # (Optional) Relative directory for installing the module. The default installation directory is **/system/etc**.
+     relative_install_dir = "init"    # (Optional) Relative directory for installing the module. The default installation directory is /system/etc.
      part_name = "partA"
    }
    ```
 
    (d) Add the module configuration **test/examples/bundle.json** to the **bundle.json** file of the component. Each component has a **bundle.json** file in the root directory of the component. For details, see the [component bundle.json file](subsys-build-component.md#configuration-rules).
 
-2. Add the component to **//vendor/{*product_company*}/{*product_name*}/config.json**.
+2. Add the component to the product configuration file. 
+
+    Add the component to **//vendor/{*product_company*}/{*product_name*}/config.json**.
+
+    The following uses **vendor/hisilicon/hispark_taurus_standard/config.json** as an example:
+
+    ```shell
+      {
+        "product_name": "hispark_taurus_standard",
+        "device_company": "hisilicon",
+        "device_build_path": "device/board/hisilicon/hispark_taurus/linux",
+        "target_cpu": "arm",
+        "type": "standard",
+        "version": "3.0",
+        "board": "hispark_taurus",
+        "inherit": [ "productdefine/common/base/standard_system.json",
+                    "productdefine/common/inherit/ipcamera.json"
+        ],
+        "enable_ramdisk": true,
+        "subsystems": [
+          {
+            "subsystem": "subsystem_examples",                              # Subsystem to which the component belongs.
+            "components": [
+              {
+                "component": "partA",                                       # Component name.
+                "features": []                                              # Configurable features of the component.
+              }
+            ]
+          },
+        ···
+      }
+    ```
+
+    The configuration file contains information about the the product name and chip vendor. **inherit** specifies the dependent, and **subsystems** specifies the components other than the common components.
 
     For example, add "subsystem_examples:partA" to the product **config.json** file. Then, **partA** will be built and packaged into the distribution.
 
@@ -149,7 +184,7 @@ When adding a component, you must add the component definition to the JSON file
 
    You can start the build by using the [CLI or hb tool](subsys-build-all.md#build-commands). The following uses the CLI as an example:
 
-   You can run '--build-target componentName' to build a component separately. For example, to build the musl component of hispark_taurus_standard, run the following command:
+   You can run '**--build-target *componentName***' to build a component separately. For example, to build the musl component of hispark_taurus_standard, run the following command:
 
    ```
    ./build.sh --product-name hispark_taurus_standard --build-target musl --ccache