update en/device-dev/driver/driver-platform-watchdog-develop.md.

Signed-off-by: Nking_he <6384784@qq.com>

en/device-dev/driver/driver-platform-watchdog-develop.md

@@ -130,6 +130,7 @@ The Watchdog module adaptation involves the following steps:
         For details, see [Available APIs](#available-apis).
 
 4.  \(Optional\) Debug the driver.
+
     For new drivers, verify basic functions, for example, verify the information returned after the connect operation and whether the watchdog timer is successfully set.