fix typo

Author: karlsoderby

content/hardware/02.hero/boards/uno-wifi-rev2/tutorials/uno-wifi-rev-2/uno-wifi-r2-chromebook-installation/uno-wifi-r2-chromebook-installation.md

@@ -46,7 +46,7 @@ First download the [optiboot_atmega4.hex](/resources/firmware/optiboot_atmega480
 
 Connect your UNO WiFi Rev2 board to your computer and follow the instructions for each operative system below.
 
-***It is important that you move the `optiboot_atmega4.hex` file to your desktop folder, otherwise the following commands wont work.***
+***It is important that you move the `optiboot_atmega4.hex` file to your desktop folder, otherwise the following commands won't work.***
 
 ### Mac