On the syscall conversions, we used uppercase for the sections,
but this is too bold. So, convert them to Camel Case, as it
looks visually better.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

The syscall pages are written to be used also as man-pages.

However, they don't match the format used by kernel-doc
generated pages from DocBook. Rewrite them to match it.

One side effect is that now all such pages at the book
will have the same format, reducing the format differences
between DVB and the other parts of the book.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Just like V4L, split the DVB function calls into one file per
system call. This is a requirement for the man pages creator
on Sphinx to work, and makes the document easier to maintain.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>