fix: pk notes

content/tutorials/how-to-send-l1-l2-transaction/10.index.md

@@ -86,6 +86,11 @@ Before continue, make sure you have the following:
     WALLET_PRIVATE_KEY=0x..;
     ```
 
+    ::callout{icon="i-heroicons-exclamation-triangle"}
+    Always use a separate wallet with no real funds for development.
+    Make sure your `.env` file is not pushed to an online repository by adding it to a `.gitignore` file.
+    ::
+
 ## Step-by-step
 
 Sending an L1->L2 transaction requires following these steps:
@@ -95,7 +100,7 @@ Sending an L1->L2 transaction requires following these steps:
     ```ts
     const l1provider = new Provider(L1_RPC_ENDPOINT);
     const l2provider = new Provider(L2_RPC_ENDPOINT);
-    const wallet = new Wallet(WALLET_PRIV_KEY, l2provider, l1provider);
+    const wallet = new Wallet(WALLET_PRIVATE_KEY, l2provider, l1provider);
     ```
 
 1. Retrieve the current gas price on L1.