Update ERC-7496: Update erc-7496.md - trait metadata as required

Merged by EIP-Bot.

Author: ryanio

ERCS/erc-7496.md

@@ -55,7 +55,7 @@ The `traitKey` SHOULD be a `keccak256` hash of a human readable trait name.
 
 ### Metadata
 
-Trait metadata is an optional way to define additional information about which traits are present in a contract, how to parse and display trait values, and permissions for setting trait values.
+Trait metadata is necessary to provide information about which traits are present in a contract, how to display trait names and values, and other optional features.
 
 The trait metadata must be compliant with the [specified schema](../assets/eip-7496/DynamicTraitsSchema.json).