Bulild-in typo fixed

Bulild-in typo fixed

Author: jcarolinares

content/hardware/06.nicla/boards/nicla-voice/tutorials/user-manual/content.md

@@ -1434,7 +1434,7 @@ The example code shown above creates a Bluetooth® Low Energy service and charac
 
 - The code begins by importing all the necessary libraries and defining the Bluetooth® Low Energy service and characteristics.
 - In the `setup()` function, the code initializes the Nicla Voice board and sets up the Bluetooth® Low Energy service and characteristic; then, it begins advertising the defined Bluetooth® Low Energy service.
-- A Bluetooth® Low Energy connection is constantly verified in the `loop()` function, being the build-in LED in red while looking for a connection. When a central device connects to the Nicla Voice, its built-in LED will change its color to blue. The code then enters into a loop that constantly reads the voltage level from an analog input and maps it to a percentage value between 0 and 100. The voltage level is printed to the Serial Monitor and transmitted to the central device over the defined Bluetooth® Low Energy characteristic.
+- A Bluetooth® Low Energy connection is constantly verified in the `loop()` function, being the built-in LED in red while looking for a connection. When a central device connects to the Nicla Voice, its built-in LED will change its color to blue. The code then enters into a loop that constantly reads the voltage level from an analog input and maps it to a percentage value between 0 and 100. The voltage level is printed to the Serial Monitor and transmitted to the central device over the defined Bluetooth® Low Energy characteristic.
 
 You can use the [nRF Connect for Mobile](https://www.nordicsemi.com/Products/Development-tools/nrf-connect-for-mobile) app from Nordic Semiconductor to test the functionality of the example code shown below. nRF Connect is a powerful tool that allows you to scan and explore Bluetooth® Low Energy devices and communicate with them.
 
@@ -1481,4 +1481,4 @@ Join our community forum to connect with other Nicla Voice users, share your exp
 
 Please get in touch with our support team if you need personalized assistance or have questions not covered by the help and support resources described before. We're happy to help you with any issues or inquiries about the Nicla Voice.
 
-- [Contact us page](https://www.arduino.cc/en/contact-us/) 
+- [Contact us page](https://www.arduino.cc/en/contact-us/)