Update lowlatencytxnsend.md

Add base64 example

docs/source/lowlatencytxnsend.md

@@ -86,10 +86,10 @@ Additionally, this method always sets skip_preflight=true, which means the trans
 
 | Parameter | Type   | Description                                                                                      |
 |-----------|--------|--------------------------------------------------------------------------------------------------|
-| `params`  | string | **REQUIRED**: First Transaction Signature embedded in the transaction, as base-58 or base-64 encoded string |
+| `params`  | string | **REQUIRED**: First Transaction Signature embedded in the transaction, as base-58(default) or base-64 encoded string |
 
 
-##### Request Example
+##### Request Example base58
 
 ```bash
 curl https://mainnet.block-engine.jito.wtf/api/v1/transactions -X POST -H "Content-Type: application/json" -d '
@@ -102,6 +102,21 @@ curl https://mainnet.block-engine.jito.wtf/api/v1/transactions -X POST -H "Conte
   ]
 }'
 ```
+##### Request Example base64
+```
+curl https://mainnet.block-engine.jito.wtf/api/v1/transactions -X POST -H "Content-Type: application/json" -d '
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "method": "sendTransaction",
+  "params": [
+    "4hXTCkRzt9WyecNzV1XPgCDfGAZzQKNxLXgynz5QDuWWPSAZBZSHptvWRL3BjCvzUXRdKvHL2b7yGrRQcWyaqsaBCncVG7BFggS8w9snUts67BSh3EqKpXLUm5UMHfD7ZBe9GhARjbNQMLJ1QD3Spr6oMTBU6EhdB4RD8CP2xUxr2u3d6fos36PD98XS6oX8TQjLpsMwncs5DAMiD4nNnR8NBfyghGCWvCVifVwvA8B8TJxE1aiyiv2L429BCWfyzAme5sZW8rDb14NeCQHhZbtNqfXhcp2tAnaAT",
+    {
+      "encoding": "base64",
+    }
+  ]
+}'
+```
 
 ##### Response