docs: fix broken references to text files

Several references got broken due to txt to ReST conversion.

Several of them can be automatically fixed with:

	scripts/documentation-file-ref-check --fix

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> # hwtracing/coresight/Kconfig
Reviewed-by: Paul E. McKenney <paulmck@kernel.org> # memory-barrier.txt
Acked-by: Alex Shi <alex.shi@linux.alibaba.com> # translations/zh_CN
Acked-by: Federico Vaga <federico.vaga@vaga.pv.it> # translations/it_IT
Acked-by: Marc Zyngier <maz@kernel.org> # kvm/arm64
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/6f919ddb83a33b5f2a63b6b5f0575737bb2b36aa.1586881715.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

drivers/gpu/drm/Kconfig

@@ -161,7 +161,7 @@ config DRM_LOAD_EDID_FIRMWARE
 	  monitor are unable to provide appropriate EDID data. Since this
 	  feature is provided as a workaround for broken hardware, the
 	  default case is N. Details and instructions how to build your own
-	  EDID data are given in Documentation/driver-api/edid.rst.
+	  EDID data are given in Documentation/admin-guide/edid.rst.
 
 config DRM_DP_CEC
 	bool "Enable DisplayPort CEC-Tunneling-over-AUX HDMI support"