sphinx: rename top level document in each manual

It is more common to call the top level document index.rst. This is
what this patch is doing, along with all required references fixup.

(From yocto-docs rev: 2cea7fbba9210479fc0387d7e1b80da9885558f0)

Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/documentation/kernel-dev/kernel-dev-advanced.rst b/documentation/kernel-dev/kernel-dev-advanced.rst
index db0a1eb2e5..cc48343257 100644
--- a/documentation/kernel-dev/kernel-dev-advanced.rst
+++ b/documentation/kernel-dev/kernel-dev-advanced.rst
@@ -474,7 +474,7 @@ supported kernel type.
 This section overviews the BSP description structure, the aggregation
 concepts, and presents a detailed example using a BSP supported by the
 Yocto Project (i.e. BeagleBone Board). For complete information on BSP
-layer file hierarchy, see the :doc:`../bsp-guide/bsp-guide`.
+layer file hierarchy, see the :doc:`../bsp-guide/index`.
 
 Description Overview
 ~~~~~~~~~~~~~~~~~~~~