V4L/DVB (3336): Bt8xx documentation authors fix

- use one Author per line, which allows us to add more
  authors later without creating a mess.
- Add Michael Krufky due to -git commit
	2cbeddc9Signed-off-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

Documentation/dvb/bt8xx.txt

@@ -111,4 +111,8 @@ source:  linux/Documentation/video4linux/CARDLIST.bttv
 If you have problems with this please do ask on the mailing list.
 
 --
-Authors: Richard Walker, Jamie Honan, Michael Hunold, Manu Abraham
+Authors: Richard Walker,
+	 Jamie Honan,
+	 Michael Hunold,
+	 Manu Abraham,
+	 Michael Krufky