doc: Document rcuperf's module parameters

This commit adds documentation for the rcuperf module parameters.

Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-05-29 14:24:03 -07:00
commit 847dd70aa9