Documentation: fb: Split toctree

Framebuffer docs toctree consists of driver-independent docs
(e.g. API docs) and driver-specific docs. The latter has much
more entries.

Group the docs into separate toctrees.

Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>

Author: bagasme

Documentation/fb/index.rst

@@ -4,42 +4,52 @@
 Frame Buffer
 ============
 
+General information
+===================
+
+.. toctree::
+   :maxdepth: 1
+
+   api
+   cmap_xfbdev
+   deferred_io
+   fbcon
+   framebuffer
+   internals
+   modedb
+
+Driver documentation
+====================
+
 .. toctree::
-    :maxdepth: 1
-
-    api
-    arkfb
-    aty128fb
-    cirrusfb
-    cmap_xfbdev
-    deferred_io
-    efifb
-    ep93xx-fb
-    fbcon
-    framebuffer
-    gxfb
-    intel810
-    internals
-    lxfb
-    matroxfb
-    metronomefb
-    modedb
-    pvr2fb
-    pxafb
-    s3fb
-    sa1100fb
-    sh7760fb
-    sisfb
-    sm501
-    sm712fb
-    sstfb
-    tgafb
-    tridentfb
-    udlfb
-    uvesafb
-    vesafb
-    viafb
-    vt8623fb
+   :maxdepth: 1
+
+   arkfb
+   aty128fb
+   cirrusfb
+   efifb
+   ep93xx-fb
+   gxfb
+   intel810
+   lxfb
+   matroxfb
+   metronomefb
+   pvr2fb
+   pxafb
+   s3fb
+   sa1100fb
+   sh7760fb
+   sisfb
+   sm501
+   sm712fb
+   sstfb
+   tgafb
+   tridentfb
+   udlfb
+   uvesafb
+   vesafb
+   viafb
+   vt8623fb
 
 .. only::  subproject and html