pktgen: remove obsolete "max_before_softirq" from pktgen doc

And cleanup some whitespaces in pktgen.txt.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/pktgen.txt

@@ -53,10 +53,9 @@ For ixgbe use e.g. "30" resulting in approx 33K interrupts/sec (1/30*10^6):
 Viewing threads
 ===============
 /proc/net/pktgen/kpktgend_0
-Name: kpktgend_0  max_before_softirq: 10000
 Running:
 Stopped: eth1
-Result: OK: max_before_softirq=10000
+Result: OK: add_device=eth1
 
 Most important are the devices assigned to the thread.  Note that a
 device can only belong to one thread.
@@ -247,7 +246,6 @@ stop
 
 add_device
 rem_device_all
-max_before_softirq
 
 
 ** Device commands: