media: docs: intro.rst actually contain DVB references

This document doesn't describe the DVB subsystem. Instead, it
just contain references to some places.

Better name it and improve its contents.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/admin-guide/media/intro.rst → Documentation/admin-guide/media/dvb_references.rst

 .. SPDX-License-Identifier: GPL-2.0
 
-Introduction
-============
+References
+==========
 
-The main development site and GIT repository for these
+The main development site and GIT repository for Digital TV
 drivers is https://linuxtv.org.
 
 The DVB mailing list linux-dvb is hosted at vger. Please see
 http://vger.kernel.org/vger-lists.html#linux-media for details.
 
-There are also some other old lists hosted at https://linuxtv.org/lists.php. Please check the archive https://linuxtv.org/pipermail/linux-dvb/.
+There are also some other old lists hosted at:
+https://linuxtv.org/lists.php. If you're insterested on that for historic
+reasons, please check the archive at https://linuxtv.org/pipermail/linux-dvb/.
 
 The media subsystem Wiki is hosted at https://linuxtv.org/wiki/.
-Please check it before asking newbie questions on the list.
+There, you'll find lots of information, from both development and usage
+of media boards. Please check it before asking newbie questions on the
+mailing list or IRC channels.
 
-API documentation is documented at the Kernel. You'll also find useful
-documentation at: https://linuxtv.org/docs.php.
+The API documentation is documented at the Kernel tree. You can find it
+in both html and pdf formats, together with other useful documentation at:
+
+  - https://linuxtv.org/docs.php.
 
 You may also find useful material at https://linuxtv.org/downloads/.
 
-In order to get firmware from proprietary drivers, there's a script at
-the kernel tree, at scripts/get_dvb_firmware.
+In order to get the needed firmware for some drivers to work, there's
+a script at the kernel tree, at scripts/get_dvb_firmware.

Documentation/admin-guide/media/index.rst

@@ -72,14 +72,12 @@ Linux Digital TV driver-specific documentation
 	:maxdepth: 5
 	:numbered:
 
-	intro
-
-	cards
+	dvb_intro
 	ci
 	faq
+	dvb_references
 
-	dvb_intro
-
+	cards
 	avermedia
 	bt8xx
 	lmedm04