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, 2 insertions, 2 deletions

diff --git a/documentation/ref-manual/ref-variables.rst b/documentation/ref-manual/ref-variables.rst
index f8cd5416d9..5a52833e84 100644
--- a/documentation/ref-manual/ref-variables.rst
+++ b/documentation/ref-manual/ref-variables.rst
@@ -8154,7 +8154,7 @@ system and gives an overview of their function and contents.
       ":ref:`sdk-manual/sdk-intro:the cross-development toolchain`"
       section in the Yocto Project Overview and Concepts Manual. For
       information on setting up a cross-development environment, see the
-      :doc:`../sdk-manual/sdk-manual` manual.
+      :doc:`../sdk-manual/index` manual.
 
    :term:`TOOLCHAIN_OUTPUTNAME`
       This variable defines the name used for the toolchain output. The
@@ -8184,7 +8184,7 @@ system and gives an overview of their function and contents.
       ":ref:`sdk-manual/sdk-intro:the cross-development toolchain`"
       section in the Yocto Project Overview and Concepts Manual. For
       information on setting up a cross-development environment, see the
-      :doc:`../sdk-manual/sdk-manual` manual.
+      :doc:`../sdk-manual/index` manual.
 
    :term:`TOPDIR`
       The top-level :term:`Build Directory`. BitBake