[PC-1116] Small fix

Removing duplicated sentence

Author: Jorgetrujilloroman

content/hardware/04.pro/boards/portenta-h7/tutorials/over-the-air-update/content.md

@@ -138,7 +138,6 @@ Convert your encoded file into `.ota` format
 
 You can use `OTA_Usage_Portenta.ino.PORTENTA_H7_M7` as a sketch name for facilitated identification of the file. After this, you will have the `.ota` file of the sketch that you will use with the OTA process. 
 
-### Installing Python 3 On Linux 
 ### Installing Python 3 On Linux
 
 If you recently installed a Linux distribution, maybe you can't run the **bin2ota.py** script. This may be because you need to install [Python 3](https://www.python.org/) and the necessary modules. To do it execute the next command on your **Linux terminal**: