hwdef: add missing ## Pinout headers

Author: peterbarker

libraries/AP_HAL_ChibiOS/hwdef/NarinFC-H7/README.md

@@ -70,6 +70,8 @@ Compared with previous autopilots, it has better performance and higher reliabil
 
   Serial protocols can be adjusted to personal preferences.
 
+## Pinout
+
 ![Port Diagram & Pin outs](./images/4.Port_Diagram_Pin_outs_Diagram-A.png "Port Diagram-A")
 
 ### 1. TELEM1, TELEM2 Port

libraries/AP_HAL_ChibiOS/hwdef/NarinFC-X3/README.md

@@ -68,8 +68,9 @@ Compared with previous autopilots, it has better performance and higher reliabil
 
   Serial protocols can be adjusted to personal preferences.
 
-![Port Diagram-TOP_BOTTOM](./images/NarinFC_X3_TOP_BOTTOM.png "Port Diagram-TOP_BOTTOM")
+## Pinout
 
+![Port Diagram-TOP_BOTTOM](./images/NarinFC_X3_TOP_BOTTOM.png "Port Diagram-TOP_BOTTOM")
 
 ### 1. I2C, UART2 Port