Fix whitespace in docs (#3832)

Co-authored-by: Francisco <frangio.1@gmail.com>

docs/modules/ROOT/pages/erc721.adoc

@@ -87,4 +87,4 @@ A preset ERC721 is available, https://github.com/OpenZeppelin/openzeppelin-contr
 
 This contract is ready to deploy without having to write any Solidity code. It can be used as-is for quick prototyping and testing but is also suitable for production environments.
 
-NOTE: Contract presets are now deprecated in favor of https://wizard.openzeppelin.com[Contracts Wizard] as a more powerful alternative.
+NOTE: Contract presets are now deprecated in favor of https://wizard.openzeppelin.com[Contracts Wizard] as a more powerful alternative.