Update README.adoc

Third attempt and a clean README

Author: 7west

uart/README.adoc

@@ -4,11 +4,10 @@
 Send data from the UART1 port to the UART0 port. 
 
 == Other code to try
-[source.python]
+```python
 uart0 = UART(0)     #opens a UART connection at the default baudrate of 115,200
-
 uart0.readline()    #reads until the CR (\r) and NL (\n) characters then returns the line
-
+```
 
 == Wiring information