doc: Update UP.rst
authorPaul E. McKenney <paulmck@kernel.org>
Fri, 4 Nov 2022 23:45:55 +0000 (16:45 -0700)
committerPaul E. McKenney <paulmck@kernel.org>
Thu, 5 Jan 2023 19:27:56 +0000 (11:27 -0800)
commitc8f2310e210ceedab86f1f696d27f7b5dd87959a
treeaaa6b0f8c5ad4ef8ef97ae6068f1bea3542b8269
parent0c208a7930228a12a78cc2c11f6f09274872ec83
doc: Update UP.rst

This commit updates UP.rst to reflect changes over the past few years,
including the advent of userspace RCU libraries for constrained systems.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Documentation/RCU/UP.rst