[css-conditional-5] Fix dfn of "<font-format>"

Final `>` was missing.

Author: tidoust

css-conditional-5/Overview.bs

@@ -78,7 +78,7 @@ Extensions to the ''@supports'' rule</h2>
 		                    | color-colrv0 | color-colrv1 | color-svg | color-sbix | color-cbdt
 		                    | variations | palettes | incremental ]
 		<dfn>&lt;supports-font-format-fn></dfn> = font-format( <<font-format>> )
-		<dfn>&lt;font-format</dfn> = [ collection | embedded-opentype | opentype
+		<dfn>&lt;font-format></dfn> = [ collection | embedded-opentype | opentype
 		                    | svg | truetype | woff | woff2 ]
 	</pre>