Correct the commenting to Python type

My bad - this is python not something with that kind of commenting.

Author: Aterfax

pirc522/rfid.py

@@ -55,18 +55,17 @@ class RFID(object):
 
     antenna_gain = 0x04
 
-/*antenna_gain
-  defines the receiver's signal voltage gain factor:
-  000 18 dB HEX = 0x00
-  001 23 dB HEX = 0x01
-  010 18 dB HEX = 0x02  
-  011 23 dB HEX = 0x03
-  100 33 dB HEX = 0x04
-  101 38 dB HEX = 0x05
-  110 43 dB HEX = 0x06
-  111 48 dB HEX = 0x07
-  3 to 0 reserved - reserved for future use
-*/
+#antenna_gain
+#  defines the receiver's signal voltage gain factor:
+#  000 18 dB HEX = 0x00
+#  001 23 dB HEX = 0x01
+#  010 18 dB HEX = 0x02  
+#  011 23 dB HEX = 0x03
+#  100 33 dB HEX = 0x04
+#  101 38 dB HEX = 0x05
+#  110 43 dB HEX = 0x06
+#  111 48 dB HEX = 0x07
+# 3 to 0 reserved - reserved for future use
 
     authed = False
     irq = threading.Event()