Update non-fungible-tokens.md (#1757)

changed SIP-010 to the correct SIP-009

Author: shittuisrael004

docs/build/get-started/create-a-token/non-fungible-tokens.md

@@ -140,7 +140,7 @@ This is the Clarity code we need in order to create an NFT, with one additional
 The token contract example above is passing in an already deployed trait on mainnet into the `impl-trait` function. You can use this same deployed trait for your own NFT contract as well.
 
 {% hint style="success" %}
-Deployed SIP-010 trait contracts you can directly implement in your custom token contract:
+Deployed SIP-009 trait contracts you can directly implement in your custom token contract:
 
 * \[mainnet] SP2PABAF9FTAJYNFZH93XENAJ8FVY99RRM50D2JG9.nft-trait
 * \[testnet] ST1NXBK3K5YYMD6FD41MVNP3JS1GABZ8TRVX023PT.nft-trait