Small grammarly corrections.

Author: Jorgetrujilloroman

content/hardware/05.pro-solutions/solutions-and-kits/opta/tutorials/getting-started/content.md

@@ -108,7 +108,7 @@ Opta™ has a programmable button, shown in the image below and identified as US
 
 ![The button and STATUS LEDs that will light up on the Opta™](assets/opta-device-button.svg)
 
-The button is defined in the core as `BTN_USER`: 'HIGH' as default (not pressed),  and 'LOW' when pressed. The new sketch will turn the STATUS LEDs on one by one when the button is pressed and then start over when all the lights have been turned on. Below you can find the entire sketch, where a simple [Switch (case) Statement](https://www.arduino.cc/reference/en/language/structure/control-structure/switchcase/) is used, and an image highlighting where the USER button is located on the device. 
+The button is defined in the core as `BTN_USER`: 'HIGH' as default (not pressed),  and 'LOW' when pressed. The new sketch will turn on the STATUS LEDs one by one when the button is pressed and then start over when all the lights have been turned on. Below you can find the entire sketch, where a simple [Switch (case) Statement](https://www.arduino.cc/reference/en/language/structure/control-structure/switchcase/) is used, and an image highlighting where the USER button is located on the device. 
 
 ```arduino
 int buttonState = 0;