doc: Update whatisRCU.rst

The kfree_rcu() macro is deprecated.  Rename it to its new
kfree_rcu_mightsleep() name in this documentation.

Acked-by: Joel Fernandes (Google) <[email protected]>
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Joel Fernandes (Google) <[email protected]>
1 file changed