ref-manual: Updated image-live.bbclass description

Fixes [YOCTO #9001]

Updated the image-live class description to specifically mention
creating *.iso and *.hddimg images as "live" images.  Provided more
explanation about usage through the NOISO and NOHDD variables.

Also, provided a cross-referencing link back to the updated
image-live class from the EFI_PROVIDERS variable.

(From yocto-docs rev: 788061b2911339c8396b798a0ab5635ab5bb89e1)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index be509c4a81..94558df4b9 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -3880,7 +3880,9 @@
                 <para>
                     See the
                     <link linkend='ref-classes-systemd-boot'><filename>systemd-boot</filename></link>
-                    class for more information.
+                    and
+                    <link linkend='ref-classes-image-live'><filename>image-live</filename></link>
+                    classes for more information.
                 </para>
             </glossdef>
         </glossentry>