admin-guide: move tainted kernels info to a separate file

The tainted kernels info is not directly related to
the oops tracing. So, let's move it to a separate file.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/admin-guide/index.rst b/Documentation/admin-guide/index.rst
index 98e60f6..86a6ab9 100644
--- a/Documentation/admin-guide/index.rst
+++ b/Documentation/admin-guide/index.rst
@@ -8,7 +8,7 @@
 
 This initial section contains overall information, including the README
 file describing the kernel as a whole, documentation on kernel parameters,
-etc. 
+etc.
 
 .. toctree::
    :maxdepth: 1
@@ -22,12 +22,13 @@
 
 .. toctree::
    :maxdepth: 1
-   
+
    reporting-bugs
    security-bugs
    bug-hunting
    bug-bisect
    oops-tracing
+   tainted-kernels
    ramoops
    dynamic-debug-howto
    init
@@ -38,7 +39,7 @@
 
 .. toctree::
    :maxdepth: 1
-   
+
    sysfs-rules
 
 The rest of this manual consists of various unordered guides on how to
@@ -46,7 +47,7 @@
 
 .. toctree::
    :maxdepth: 1
-   
+
    initrd
    serial-console
    braille-console