Update Open_Sea.json (#93)

Author: GraphMaster99

testnet/Open_Sea.json

@@ -6,6 +6,7 @@
     "addresses": {},
     "links": {
         "project": "https://opensea.io/",
-        "twitter": "https://x.com/opensea"
+        "twitter": "https://x.com/opensea",
+        "docs": "https://docs.opensea.io/"
     }
-}
+}