[css-color-hdr][editorial] silence bikeshed whining about missing (not missing) images

Author: svgeesus

css-color-hdr-1/Overview.bs

@@ -128,7 +128,7 @@ Introduction {#intro}
 	to support High Dynamic Range (HDR).
 
 	<figure id="fig-eotf">
-		<p><img src="./images/lin-srgb-hlg-pq.png" alt=""></p>
+		<p><img src="./images/lin-srgb-hlg-pq.png" alt="" width="839"></p>
 		<!-- alt text would be identical to figure caption -->
 		<figcaption>
 			The Electro-Optical Transfer Functions (EOTF)