sphinx: fix links when the link text should be displayed

When an hyperlink should be display in the output, there is no need to
any specific syntax or marker, the parser finds links and mail
addresses in ordinary text. Somehow the conversion from pandoc
generated wrong output in the form: ` <link>`__. This patch is
generated using the following Python regexp:

    line = re.sub("` <(https?://.*)>`__",
                  "\\1",
                  line)

(From yocto-docs rev: a35d735a74425dff34c63c086947624467658c40)

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

documentation/dev-manual/dev-manual-start.rst

@@ -445,14 +445,14 @@ as your Yocto Project build host:
 
 5. *Optionally Orient Yourself With Docker:* If you are unfamiliar with
    Docker and the container concept, you can learn more here -
-   ` <https://docs.docker.com/get-started/>`__.
+   https://docs.docker.com/get-started/.
 
 6. *Launch Docker or Docker Toolbox:* You should be able to launch
    Docker or the Docker Toolbox and have a terminal shell on your
    development host.
 
 7. *Set Up the Containers to Use the Yocto Project:* Go to
-   ` <https://github.com/crops/docker-win-mac-docs/wiki>`__ and follow
+   https://github.com/crops/docker-win-mac-docs/wiki and follow
    the directions for your particular build host (i.e. Linux, Mac, or
    Windows).
 
@@ -514,7 +514,7 @@ your Yocto Project build host:
 
 4. *Optionally Orient Yourself on WSL:* If you are unfamiliar with WSL,
    you can learn more here -
-   ` <https://docs.microsoft.com/en-us/windows/wsl/wsl2-about>`__.
+   https://docs.microsoft.com/en-us/windows/wsl/wsl2-about.
 
 5. *Launch your WSL Distibution:* From the Windows start menu simply
    launch your WSL distribution just like any other application.