toaster-manual: fix description of introduction video

The video referred to didn't correspond to the latest
Poky releases.

(From yocto-docs rev: 29780dee7b183ebb13571dcab8e20d22bfbfeb4b)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/toaster-manual/intro.rst

@@ -76,9 +76,8 @@ extensive information about the build process.
    -  See performance information such as build time, task time, CPU
       usage, and disk I/O.
 
-For an overview of Toaster shipped with the Yocto Project &DISTRO;
-Release, see the "`Toaster - Yocto Project
-2.2 <https://youtu.be/BlXdOYLgPxA>`__" video.
+For an overview of Toaster, see this
+`introduction video <https://youtu.be/BlXdOYLgPxA>`__.
 
 Installation Options
 ====================