Update content/arduino-cloud/03.cloud-interface/00.sketches/sketches.md

Co-authored-by: Fabio C <fabiomassimo.centonze@gmail.com>

Author: BenjaminDannegard

content/arduino-cloud/03.cloud-interface/00.sketches/sketches.md

@@ -151,7 +151,7 @@ To work, the NetworkConfigurator needs:
 The `NetworkConfigurator` library out-of-the-box provides two Agents:
 
 - `BLEAgent` for handling the BLE communication.
-- SerialAgents for the Serial communication.
+- `SerialAgent` for the Serial communication.
 
 ## thingsProperties.h Default Setup