fix typo

Author: guimachiavelli

reference/api/settings.mdx

@@ -756,7 +756,7 @@ Updating filterable attributes will re-index all documents in the index, which c
 
 ### Filterable attribute object
 
-`filterableAttributes` may be an array of either strings filterable attribute objects.
+`filterableAttributes` may be an array of either strings or filterable attribute objects.
 
 Filterable attribute objects must contain the following fields: