rename title

Author: longfeiWan9

builder-cookbook/filecoin-pin/erc-8004-agent-registration.md

@@ -511,7 +511,7 @@ Replace `<AGENT_ID_DECIMAL>` with your agent's ID (e.g., `56`).
 
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-## Step 4: Verify Storage and PDP Proofs
+## Step 4: Check On-chain Storage Proofs
 
 Finally, let's verify that your agent card is persistently stored with cryptographic proofs.