clearify 16550A readme

Hope this improves the understandability.

Jan

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Index: drivers/16550A/README
===================================================================

16550A/README +7 -4

@@ -21,10 +21,14 @@
                      [tx_fifo=<len1>[,<len2>...]] [start_index=<index>]
 
 Arguments:
-    ioaddr<N>   - I/O address of device <N> (e.g. 0x3f8 for ttyS0)
-    irq<N>      - interrupt number of device <N> (e.g. 4 for ttyS0)
-    tx_fifo<N>  - Transmitter FIFO size in bytes of device <N>, default is 16
+    ioaddr      - I/O addresses of the devices, comma separated
+                  (e.g. "0x3f8,0x2f8")
+    irq         - interrupt numbers of the devices, comma separated
+                  (e.g. "4,3")
+    tx_fifo     - Transmitter FIFO sizes of the devices in bytes, comma
+                  separated, default is 16
     start_index - First device instance number to be used, default is 0
+                  (=> "rtser0")
 
 
 Usage
 
 
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