refactor(docs): remove redundant collateral reservation methods and clarify redemption process

Author: fassko

docs/fassets/developer-guides/7-fassets-redeem.mdx

@@ -309,9 +309,6 @@ The FAssets agent should perform the redemption, and the user must retrieve the
 If the agent is unable to redeem the assets on the underlying chain in the specified time.
 In that case, the user can execute the [`redemptionPaymentDefault`](/fassets/reference/IAssetManager#redemptionpaymentdefault) function to receive compensation from the agent's collateral.
 
-If the agent rejects the redemption request and no other agent takes over the redemption, the redeemer or appointed executor calls [`rejectedRedemptionPaymentDefault`](/fassets/reference/IAssetManager#rejectedredemptionpaymentdefault) method and receives payment in collateral.
-The agent can also call default if the redeemer is unresponsive to payout the redeemer and free the remaining collateral.
-
 ## Next Steps
 
 :::tip

docs/fassets/reference/IAssetManager.mdx

@@ -157,50 +157,6 @@ function reserveCollateral(
 ) external payable;
 ```
 
-### `approveCollateralReservation`
-
-Agent approves the collateral reservation request after checking the minter's identity.
-
-Parameters:
-
-- `_collateralReservationId`: Collateral reservation ID
-
-```solidity
-function approveCollateralReservation(
-    uint256 _collateralReservationId
-) external notEmergencyPaused;
-```
-
-### `rejectCollateralReservation`
-
-Agent rejects the collateral reservation request after checking the minter's identity.
-The collateral reservation fee is returned to the minter.
-
-Parameters:
-
-- `_collateralReservationId`: Collateral reservation ID
-
-```solidity
-function rejectCollateralReservation(
-    uint256 _collateralReservationId
-) external nonReentrant;
-```
-
-### `cancelCollateralReservation`
-
-Minter cancels the collateral reservation request if the agent didn't respond in time.
-The collateral reservation fee is returned to the minter.
-
-Parameters:
-
-- `_collateralReservationId`: Collateral reservation ID
-
-```solidity
-function cancelCollateralReservation(
-    uint256 _collateralReservationId
-) external nonReentrant;
-```
-
 ## Execute Minting
 
 ### `executeMinting`
@@ -265,21 +221,6 @@ function redemptionPaymentDefault(
 ) external;
 ```
 
-### `rejectedRedemptionPaymentDefault`
-
-If the agent rejected the redemption request and no other agent took over the redemption, the redeemer or appointed executor calls this method and receives payment in collateral.
-The agent can also call default if the redeemer is unresponsive, to payout the redeemer and free the remaining collateral.
-
-Parameters:
-
-- `_redemptionRequestId`: ID of an existing redemption request
-
-```solidity
-function rejectedRedemptionPaymentDefault(
-    uint256 _redemptionRequestId
-) external;
-```
-
 ## Core Vault Settings
 
 Reference for managing and interacting with FAssets `ICoreVaultSettings` contract which is inherited by the `IAssetManager` contract.