add required param to example

Author: smk762

src/pages/komodo-defi-framework/api/v20-dev/one_inch_v6_0_classic_swap_create/index.mdx

@@ -65,6 +65,7 @@ Refer to the [1inch Classic Swap documentation](https://portal.1inch.dev/documen
       "base": "ETH",
       "rel": "USDC-ERC20",
       "amount": 0.1,
+      "slippage": 1,
       "include_tokens_info": true,
       "include_protocols": true,
       "include_gas": true,