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

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

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

@@ -79,13 +79,10 @@ The PWM module adaptation involves the following steps:
     -   Initialize **PwmDev**.
     -   Instantiate **PwmMethod** in the **PwmDev** object.
 
-        >![](../public_sys-resources/icon-note.gif) **NOTE** 
+        For details, see [Available APIs](#available-apis). 
 
-        >For details, see [Available APIs](#available-apis).
-
-
-4.  Debug the driver.
-    -   \(Optional\) For new drivers, verify the basic functions, such as the PWM control status and response to interrupts.
+4.  \(Optional\) Debug the driver.
+    For new drivers, verify the basic functions, such as the PWM control status and response to interrupts.
 
 
 ## Development Example<a name="section1883877829164144"></a>
@@ -341,6 +338,3 @@ The following uses  **pwm\_hi35xx.c**  as an example to present the contents tha
             HiPwmRemove(hp); //Release HiPwm.
         }
         ```
\ No newline at end of file
-
-
-