fix path to closing slide image and add comment about use

aagi-template-revealjs.qmd

@@ -101,7 +101,10 @@ ggplot() +
 
 You can learn more about controlling the appearance of RevealJS output here: <https://quarto.org/docs/presentations/revealjs/>
 
-# Thank You{background-image="_extensions/aagi/title-slide-main.png" background-size="1050px auto" background-position="50% 85%"}
+<!-- This background won't show properly in the example rendered slide, but when used with `quarto use template AAGI-Org-AU-Public/AAGIQuarto`
+you will have the closing slide display the same image as the title slide under "Thank You" (or the H1 text of your choosing)
+-->
+# Thank You{background-image="_extensions/AAGI-Org-AU-Public/aagi/title-slide-main.png" background-size="1050px auto" background-position="50% 85%"}
 
 <!-- Uncomment if you have a bibliography
 ## References