rcu: Update trace.txt documentation to reflect recent changes

o	Remove the CONFIG_PREEMPT_RCU documentation since this
	config option has now been removed.

o	Change the now-incorrect references to "rcu" labels to
	instead be "rcu_sched".

o	Add notes stating that CONFIG_TREE_PREEMPT_RCU kernels will
	have additional "rcu_preempt" output.

o	Note the new "oqlen" field in the rcuhier output (for
	RCU callbacks orphaned by an offlined CPU).

Signed-off-by: Paul E. McKenney <[email protected]>
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LKML-Reference: <1255540559799-git-send-email->
Signed-off-by: Ingo Molnar <[email protected]>

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