add ebay device to docs

Author: h00die

documentation/modules/auxiliary/client/hwbridge/connect.md

@@ -22,6 +22,8 @@ This should **not** be taken as an endorcement for a specific brand/vendor/selle
   Band rate: 38400
   ```
 
+2. Generic ELM327 [ebay](http://www.ebay.com/itm/like/221821719820)
+
 ## Bluetooth Adapter Connection
 
 Bluetooth HWBridge adapters, depending on the Operating System, may take several additional steps to establish a connection and communications bus.