Moved to loopback directory

Author: Alasdair Allan

uart/README.adoc renamed to uart/loopback/README.adoc

@@ -12,22 +12,22 @@ See <<uart-wiring-diagram>> for wiring instructions.
 .Wiring two of the Pico's ports together. Be sure to wire UART0n TX to UART1 RX and UART0 RX to UART1 TX.
 image::pico_uart_example.png[]
 
+== List of Files
+
+A list of files with descriptions of their function;
+
+uart.py:: The example code.
+
 == Other things to try
 
 [source,python]
 ----
-uart0 = UART(0) // <1>
-uart0.readline() // <2>
+uart0 = UART(0) # <1>
+uart0.readline() # <2>
 ----
 <1> opens a UART connection at the default baudrate of 115,200
 <2> reads until the CR (\r) and NL (\n) characters then returns the line
 
-== List of Files
-
-A list of files with descriptions of their function;
-
-uart.py:: The example code.
-
 == Bill of Materials
 
 .A list of materials required for the example