docs: create a top-level arch/ directory

As the first step in bringing some order to our architecture-specific
documentation, create a top-level arch/ directory and move arch.rst as its
index.rst file.

There is no change in the rendered docs at this point.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/Documentation/index.rst b/Documentation/index.rst
index 76d1a3ec9be3..9dfdc826618c 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -99,7 +99,7 @@ Architecture-specific documentation
 .. toctree::
    :maxdepth: 2
 
-   arch
+   arch/index
 
 
 Other documentation