docs: PCI: endpoint: pci-endpoint-cfs.rst: avoid using ReST :doc:`foo` markup

The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4b18febe4a4f030dd9d43e5e6a2a0aa28bd5b734.1623824363.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/PCI/endpoint/pci-endpoint-cfs.rst

@@ -125,4 +125,4 @@ all the EPF devices are created and linked with the EPC device.
 						| interrupt_pin
 						| function
 
-[1] :doc:`pci-endpoint`
+[1] Documentation/PCI/endpoint/pci-endpoint.rst