docs: netlink: netlink-raw.rst: use :ref: instead of :doc:

Currently, rt documents are referred with:

Documentation/userspace-api/netlink/netlink-raw.rst: :doc:`rt-link<../../networking/netlink_spec/rt-link>`
Documentation/userspace-api/netlink/netlink-raw.rst: :doc:`tc<../../networking/netlink_spec/tc>`
Documentation/userspace-api/netlink/netlink-raw.rst: :doc:`tc<../../networking/netlink_spec/tc>`

Having :doc: references with relative paths doesn't always work,
as it may have troubles when O= is used. Also that's hard to
maintain, and may break if we change the way rst files are
generated from yaml. Better to use instead a reference for
the netlink family.

So, replace them by Sphinx cross-reference tag that are
created by ynl_gen_rst.py.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>

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