cosmetic: doc: driver-model: Do not number driver lists

Everytime a dead driver is removed from the list,
we must re-number. This is a painful task.

Try
  git show e53232250 -- doc/driver-model/UDM-serial.txt
  git show 6f62f4207 -- doc/driver-model/UDM-serial.txt
  git show b9f4bc34a -- doc/driver-model/UDM-serial.txt
to see what I mean.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/doc/driver-model/UDM-video.txt b/doc/driver-model/UDM-video.txt
index 342aeee..e67e9e4 100644
--- a/doc/driver-model/UDM-video.txt
+++ b/doc/driver-model/UDM-video.txt
@@ -36,39 +36,39 @@
 III) Analysis of in-tree drivers
 --------------------------------
 
-  1) arch/powerpc/cpu/mpc8xx/video.c
-  ----------------------------------
+  arch/powerpc/cpu/mpc8xx/video.c
+  -------------------------------
   This driver copies the cfb_console [ see drivers/video/cfb_console.c ]
   approach and acts only as a STDIO device. Therefore there are currently two
   possible approaches, first being the conversion of this driver to usual STDIO
   device and second, long-term one, being conversion of this driver to video
   driver that provides console.
 
-  2) arch/x86/lib/video.c
-  -----------------------
+  arch/x86/lib/video.c
+  --------------------
   This driver registers two separate STDIO devices and should be therefore
   converted as such.
 
-  3) board/bf527-ezkit/video.c
-  ----------------------------
+  board/bf527-ezkit/video.c
+  -------------------------
   This driver seems bogus as it behaves as STDIO device, but provides no input
   or output capabilities. It relies on DEV_EXT_VIDEO, which is no longer in use
   or present otherwise than as a dead code/define.
 
-  4) board/bf533-stamp/video.c
-  ----------------------------
+  board/bf533-stamp/video.c
+  -------------------------
   This driver seems bogus as it behaves as STDIO device, but provides no input
   or output capabilities. It relies on DEV_EXT_VIDEO, which is no longer in use
   or present otherwise than as a dead code/define.
 
-  5) board/bf548-ezkit/video.c
-  ----------------------------
+  board/bf548-ezkit/video.c
+  -------------------------
   This driver seems bogus as it behaves as STDIO device, but provides no input
   or output capabilities. It relies on DEV_EXT_VIDEO, which is no longer in use
   or present otherwise than as a dead code/define.
 
-  6) board/cm-bf548/video.c
-  ----------------------------
+  board/cm-bf548/video.c
+  ----------------------
   This driver seems bogus as it behaves as STDIO device, but provides no input
   or output capabilities. It relies on DEV_EXT_VIDEO, which is no longer in use
   or present otherwise than as a dead code/define.