Update file README.md

README.md

@@ -39,7 +39,7 @@ If you like you can follow [Electrosmith's Video Instructions](https://www.youtu
 1. Install Arduino IDE from [arduino.cc](https://www.arduino.cc/en/software)
 2. Follow the instructions at [sm32duino](https://github.com/stm32duino/Arduino_Core_STM32/wiki/Getting-Started):
 	1. In Arduino under `Preferences > Additional Board Manager URLs` add the following text:
-	```https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json``
+	`https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json`
 	(Note: If you already have other URLs there, you need to seperate them with a comma)
 	2. Open the `Board Manager` in Arduino (one of the icons on the left) and install the board `STM32 MCU based boards` by STMicroelectronics
 	3. Follow the extra step, download and install the STM32CubeProgrammer Software from [here](https://www.st.com/en/development-tools/stm32cubeprog.html)