Add missing space with shortcode close

Author: rundel

tests/docs/smoke-all/video/video-smoke-test.qmd

@@ -88,7 +88,7 @@ _quarto:
 {{< video https://www.youtube.com/embed/wo9vZccmqwc
   title="What is the CERN?"
   start="116"
-  aspect-ratio="21x9">}}
+  aspect-ratio="21x9" >}}
 
 :::