Revert docs from "treewide: Rename rcu_dereference_raw_notrace() to _check()"

This reverts docs from commit 355e9972da81e803bbb825b76106ae9b358caf8e.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
[ paulmck: Added Joel's SoB per Stephen Rothwell feedback. ]
[ paulmck: Joel approved via private email. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>