fix documentation typos in the compression-enable property name

ScalaWS and JavaWS docs incorrectly specified the property to turn on WS compression as `ws.compressionEnable`. I noticed this property had no effect and it actually needs to be `ws.compressionEnabled`. 

Would love to see this change make it into the 2.3.x branch as it would probably save some developer frustration. Not sure about the process for making this happen but let me know if/how I can help. Thanks!