fix index.md

Author: nnsW3

public/content/contributing/adding-products/index.md

@@ -82,7 +82,7 @@ Please also refer to our [terms of use](/terms-of-use/). Information on ethereum
 
 As is the fluid nature of Ethereum, teams and products come and go and innovation happens daily, so we'll undertake routine checks of our content to:
 
-- ensure that all dapps listed still fulfil our criteria
+- ensure that all dapps listed still fulfill our criteria
 - verify there aren't products that have been suggested that meet more of our criteria than the ones currently listed
 
 You can help with this by checking and letting us know. [Create an issue](https://github.com/ethereum/ethereum-org-website/issues/new?assignees=&labels=Type%3A+Feature&template=feature_request.yaml&title=) or send an email to [[email protected]](mailto:[email protected])