Update documentation to cover RF packets

RF packets behave identically to IR packets, so update the docs to match

README.md

@@ -23,13 +23,13 @@ Enter learning mode:
 devices[0].enter_learning()
 ```
 
-Obtain an IR packet while in learning mode:
+Obtain an IR or RF packet while in learning mode:
 ```
 ir_packet = devices[0].check_data()
 ```
 (This will return None if the device does not have a packet to return)
 
-Send an IR packet:
+Send an IR or RF packet:
 ```
 devices[0].send_data(ir_packet)
 ```

protocol.md

@@ -132,5 +132,4 @@ Todo
 ----
 
 * Support for other devices using the Broadlink protocol (various smart home devices)
-* Verify whether RF learning uses the same information. The first 4 bytes of the response packet may indicate the type of response that was learned, and the first 4 bytes of the payload may provide that back to the Broadlink on sending. Alternatively, this information may be embedded in the response data already.
 * Figure out what the format of the data packets actually is.