rcu-tasks: Improve comments explaining tasks_rcu_exit_srcu purpose

Make sure we don't need to look again into the depths of git blame in
order not to miss a subtle part about how rcu-tasks is dealing with
exiting tasks.

Suggested-by: Boqun Feng <[email protected]>
Suggested-by: Neeraj Upadhyay <[email protected]>
Suggested-by: Paul E. McKenney <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

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