sphinx: add links for Yocto project website

In DocBook, variables are used to create custom links (note that it is
not consistent everywhere, since some web addresses are still
hardcoded), such as YOCTO_HOME_URL, YOCTO_GIT_URL, YOCTO_WIKI_URL,
YOCTO_BUGS_URL and YOCTO_DL_URL..

In Sphinx they are replaced with extlinks.

(From yocto-docs rev: d25f3095a9d29a3355581d0743f27b2a423ad580)

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/sdk-manual/sdk-appendix-obtain.rst b/documentation/sdk-manual/sdk-appendix-obtain.rst
index d6d534ea93..ed460c78ea 100644
--- a/documentation/sdk-manual/sdk-appendix-obtain.rst
+++ b/documentation/sdk-manual/sdk-appendix-obtain.rst
@@ -175,8 +175,8 @@ Follow these steps to extract the root filesystem:
 1. *Locate and Download the Tarball for the Pre-Built Root Filesystem
    Image File:* You need to find and download the root filesystem image
    file that is appropriate for your target system. These files are kept
-   in machine-specific folders in the `Index of
-   Releases <&YOCTO_DL_URL;/releases/yocto/yocto-&DISTRO;/machines/>`__
+   in machine-specific folders in the
+   :yocto_dl:`Index of Releases <releases/yocto/yocto-&DISTRO;/machines/>`
    in the "machines" directory.
 
    The machine-specific folders of the "machines" directory contain