Changeset b00aedf978 ("doc: Convert to rcu_dereference.txt to rcu_dereference.rst")
renamed: Documentation/RCU/rcu_dereference.txt
to: Documentation/RCU/rcu_dereference.rst.
Update its cross-reference accordingly.
Fixes: b00aedf978 ("doc: Convert to rcu_dereference.txt to rcu_dereference.rst")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>