[css-logical-1] Fix spurious / in <img>

Author: alkorlos

css-logical-1/Overview.bs

@@ -62,7 +62,7 @@ Introduction</h2>
         that works across different writing systems:
 
     <figure>
-        <img src="./images/example01.png" width="300" height="109" />
+        <img src="./images/example01.png" width="300" height="109">
         <figcaption>Rendering of the below code in a compatible browser</figcaption>
     </figure>