[media] DocBook: Fix typo in intro.xml

This patch fix spelling typos in intro.xml.
This xml file is not created from comments within source,
I fix the xml file.
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
[hans.verkuil@cisco.com: removed mention of obsolete devfs]
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Documentation/DocBook/media/dvb/intro.xml

@@ -163,9 +163,8 @@ are called:</para>
 <para>where N enumerates the DVB PCI cards in a system starting
 from&#x00A0;0, and M enumerates the devices of each type within each
 adapter, starting from&#x00A0;0, too. We will omit the &#8220;
-<constant>/dev/dvb/adapterN/</constant>&#8221; in the further dicussion
-of these devices. The naming scheme for the devices is the same wheter
-devfs is used or not.</para>
+<constant>/dev/dvb/adapterN/</constant>&#8221; in the further discussion
+of these devices.
 
 <para>More details about the data structures and function calls of all
 the devices are described in the following chapters.</para>