docs-rst: doc-guide: split the kernel-documentation.rst contents

Having the kernel-documentation at the topmost level doesn't
allow generating a separate PDF file for it. Also, makes harder
to add extra contents. So, place it on a sub-dir.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/process/coding-style.rst b/Documentation/process/coding-style.rst
index 3e79051..d20d52a 100644
--- a/Documentation/process/coding-style.rst
+++ b/Documentation/process/coding-style.rst
@@ -525,8 +525,8 @@
 it.
 
 When commenting the kernel API functions, please use the kernel-doc format.
-See the files Documentation/kernel-documentation.rst and scripts/kernel-doc
-for details.
+See the files at :ref:`Documentation/doc-guide/ <doc_guide>` and
+``scripts/kernel-doc`` for details.
 
 The preferred style for long (multi-line) comments is: