dracut.cmdline.7.asc: document rd.ccw and rd.znet

rd.znet should be used instead of rd.ccw.

Add more info about rd.znet.

Fixes github issue 364

dracut.cmdline.7.asc

@@ -811,6 +811,9 @@ rd.zfcp=0.0.4000
 ZNET
 ~~~~
 **rd.znet=**__<nettype>__,__<subchannels>__,__<options>__::
+    The whole parameter is appended to /etc/ccw.conf, which is used on
+    RHEL/Fedora with ccw_init, which is called from udev for certain
+    devices on z-series.
     rd.znet can be specified multiple times on the kernel command line.
 +
 [listing]
@@ -1083,7 +1086,8 @@ their new replacement.
 
 rdbreak:: rd.break
 
-rd_CCW:: rd.ccw
+rd.ccw:: rd.znet
+rd_CCW:: rd.znet
 
 rd_DASD_MOD:: rd.dasd