typo

Author: kilograham

README.md

@@ -190,7 +190,7 @@ App|Description
 [picow_httpd](pico_w/wifi/httpd) | Runs a LWIP HTTP server test app
 [picow_http_client](pico_w/wifi/http_client) | Demonstrates how to make http and https requests
 [picow_http_client_verify](pico_w/wifi/http_client) | Demonstrates how to make a https request with server authentication
-[picow_mqtt_client](pico_w/wifi/mqtt) | Demonstrates how to implement an MQTT client application
+[picow_mqtt_client](pico_w/wifi/mqtt) | Demonstrates how to implement a MQTT client application
 
 #### FreeRTOS examples