update docs

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

en/device-dev/driver/driver-peripherals-external-des.md

@@ -512,7 +512,6 @@ The following uses the Hi3881 WLAN chip as an example to describe how to initial
         hi_u32 ret = NetDeviceAdd(netdev, (Protocol80211IfType)type);
         
         ...
-
         return HI_SUCCESS;
     }
     ```
@@ -580,7 +579,9 @@ The following uses the Hi3881 WLAN chip as an example to describe how to initial
 
 4. Invoke the event reporting APIs. 
 
-    The WLAN framework provides the event reporting APIs. For details, see hdf_wifi_event.c. For example, call **HdfWiFiEventNewSta AP** to report information about the newly associated STA.
+    The WLAN framework provides the event reporting APIs. For details, see **hdf_wifi_event.c**.
+    
+    For example, call **HdfWiFiEventNewSta AP** to report information about the newly associated STA. 
     
     ```c
     hi_u32 oal_cfg80211_new_sta(oal_net_device_stru *net_device, const hi_u8 *mac_addr, hi_u8 addr_len,
@@ -734,7 +735,7 @@ Develop test cases in the WLAN module unit test to verify the basic features of
 
      4. On the mobile phone, select the network named **test** in the available Wi-Fi list and enter the password. 
 
-        The network name and password are configured in the **hostapd.conf** file. You can see that network name in the connected Wi-Fi list if the connection is successful.
+        The network name and password are configured in the **hostapd.conf** file. You can see the network name in the connected Wi-Fi list if the connection is successful.
 
      5. Ping the test terminal from the development board.
 
@@ -944,12 +945,8 @@ Develop test cases in the WLAN module unit test to verify the basic features of
         ./ Test case name.
         ```
 
-        
-        
    3. Check the test case execution result.
 
-        
-
 ## Reference
 
 - Code repositories: