markers: update preempt_disable. call_rcu, rcu_barrier comments

Add comments requested by Andrew.

Updated comments about synchronize_sched().  Since we use call_rcu and
rcu_barrier now, these comments were out of sync with the code.

Signed-off-by: Mathieu Desnoyers <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Mike Mason <[email protected]>
Cc: Dipankar Sarma <[email protected]>
Cc: David Smith <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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