docs: fix infinite loop in vercel.json redirects (#33240)

Author: mdrxy

docs/vercel.json

@@ -23,14 +23,6 @@
     {
       "source": "/v0.2/:path(.*/?)*",
       "destination": "https://langchain-v02.vercel.app/v0.2/:path*"
-    },
-    {
-      "source": "/v0.3",
-      "destination": "https://langchain-v03.vercel.app/v0.3"
-    },
-    {
-      "source": "/v0.3/:path(.*/?)*",
-      "destination": "https://langchain-v03.vercel.app/v0.3/:path*"
     }
   ],
   "redirects": [