Fix typo

optical.md

@@ -388,7 +388,7 @@ All links can be provided either in the Collection or in the Item,
 unless the links are specific for each Item and/or differ between the Items.
 If that's the case, they must be provided per Item.
 
-In addition to the links defined in specific extensions above, the relation types may listed in the table below can be used.
+In addition to the links defined in specific extensions above, the relation types listed in the table below can be used.
 
 | Relation Type | Req.      | Description |
 | ------------- | --------- | ----------- |