Cosmetic Kconfig fixes

* Original commit: espressif/esp-idf@d3ed17acd7

examples/protocols/websocket/main/Kconfig.projbuild

@@ -2,7 +2,7 @@ menu "Example Configuration"
 
     config WEBSOCKET_URI
         string "Websocket endpoint URI"
-        default "ws://echo.websocket.org";
+        default "ws://echo.websocket.org"
         help
             URL of websocket endpoint this example connects to and sends echo