docs(fassets): clarify collateral reservation event details and improve payment timeframe section

Author: fassko

docs/fassets/developer-guides/5-fassets-mint.mdx

@@ -73,7 +73,8 @@ The following code demonstrates how to reserve collateral by calling the [`reser
 
 ## Send Payment on XRP Ledger
 
-The next step is to send the XRP Ledger payment to the agent. Before making the payment, it is important to understand the payment timeframes and constraints.
+The next step is to send the XRP Ledger payment to the agent.
+Before making the payment, it is important to understand the payment timeframes and constraints.
 
 <PaymentTimeframes />
 

docs/fassets/developer-guides/6-fassets-mint-executor.mdx

@@ -86,7 +86,8 @@ The following code demonstrates how to reserve collateral by calling the [`reser
 
 ## Send Payment on XRP Ledger
 
-The next step is to send the XRP Ledger payment to the agent. Before making the payment, it is important to understand the payment timeframes and constraints.
+The next step is to send the XRP Ledger payment to the agent.
+Before making the payment, it is important to understand the payment timeframes and constraints.
 
 <PaymentTimeframes />
 

docs/fassets/developer-guides/_payment_timeframes.mdx

@@ -13,7 +13,7 @@ Both constraints must be satisfied for the payment to be considered valid.
 
 #### Payment Deadline Calculation
 
-When you reserve collateral, the system provides in the [`CollateralReserved`](/fassets/reference/IAssetManagerEvents#collateralreserved) event:
+When you reserve collateral, the system emits the following values in the [`CollateralReserved`](/fassets/reference/IAssetManagerEvents#collateralreserved) event:
 
 - `lastUnderlyingBlock`: The final block number for a valid payment.
 - `lastUnderlyingTimestamp`: The deadline timestamp for payment.