[STM32MP157_DK] Update README.md

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

variants/STM32MP157_DK/README.md

@@ -13,7 +13,7 @@ Because every OS may have different software configurations (especially Device T
 * [STM32 MPU OpenSTLinux Distribution]
 * [Balena OS]
 
-Note that the first two OSes should select `stm32mp157c-dk2-m4-examples-sdcard` boot mode (or device tree configuration) on boot time. `stm32mp157c-dk2-sdcard` boot mode is also known to work but it is not guaranteed. See [ST Wiki page on boot mode] for more detail. If you are using it for your own OS, see the [Linux Device Tree considerations](#Linux-Device-Tree-considerations) section.
+__Note that the first two OSes should select `stm32mp157c-dk2-m4-examples-sdcard` boot mode (or device tree configuration) on boot time.__ `stm32mp157c-dk2-sdcard` boot mode is also known to work but it is not guaranteed. See [ST Wiki page on boot mode] for more detail. If you are using it for your own OS, see the [Linux Device Tree considerations](#Linux-Device-Tree-considerations) section.
 
 ## How to use
 
@@ -96,7 +96,7 @@ There are additional pins for LEDs and buttons.
 
 ## Uploading
 
-As mentioned above `run_arduino.sh` file should be uploaded manually in order to work. There are many ways to upload the file.
+As mentioned above `run_arduino.sh` file have to be uploaded manually to the Linux file system in order to be executed on the board directly through the Linux console. There are many ways to upload the file.
 
 ### Over Network