[css-image-animations] Fix typo

Author: frivoal

css-image-animation-1/Overview.bs

@@ -55,7 +55,7 @@ Introduction {#intro}
 	websites need to control the playback experience,
 	separately for each different uses of animated images.
 
-	This specification proposes a CSS property ('image animation')
+	This specification proposes a CSS property ('image-animation')
 	and a pseudo-class ('':animated-image'')
 	to enable authors to control animations,
 	and to target this control and any <abbr title="user interface">UI</abbr> they wish to associate with it