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/transitioning-to-a-custom-environment.rst b/documentation/transitioning-to-a-custom-environment.rst
index b87fec6893..3663f53364 100644
--- a/documentation/transitioning-to-a-custom-environment.rst
+++ b/documentation/transitioning-to-a-custom-environment.rst
@@ -8,7 +8,7 @@ Transitioning to a custom environment for systems development
 
 .. note::
 
-   So you've finished the :doc:`brief-yoctoprojectqs/brief-yoctoprojectqs` and
+   So you've finished the :doc:`brief-yoctoprojectqs/index` and
    glanced over the document :doc:`what-i-wish-id-known`, the latter contains
    important information learned from other users. You're well prepared. But
    now, as you are starting your own project, it isn't exactly straightforward what