feat(docs): add RedemptionPerformed event to IAssetManagerEvents documentation (#740)

Author: fassko

docs/fassets/reference/IAssetManagerEvents.mdx

@@ -194,3 +194,17 @@ event RedemptionTicketUpdated(
     uint256 indexed redemptionTicketId,
     uint256 ticketValueUBA);
 ```
+
+### `RedemptionPerformed`
+
+The event is emitted when the agent provides proof of redemption payment, and the agent's collateral is released.
+
+```solidity
+event RedemptionPerformed(
+    address indexed agentVault,
+    address indexed redeemer,
+    uint64 indexed requestId,
+    bytes32 transactionHash,
+    uint256 redemptionAmountUBA,
+    int256 spentUnderlyingUBA);
+```