docs: Update documentation for controller PR #1901 (#64)

Updates documentation to reflect changes made in:
    Prepare release: 0.9.3

    Related controller PR: cartridge-gg/controller#1901

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: tarrencev

src/pages/controller/overview.md

@@ -46,8 +46,9 @@ title: Controller Overview
 
 ### Monetization and Payments
 
--   Built-in purchase system for seamless game monetization
--   Starterpack bundles combining credits and game assets
--   Multi-chain cryptocurrency payment support (Starknet, Base, Solana)
+-   Built-in purchase system for seamless game monetization with enhanced multichain flows
+-   Starterpack bundles combining credits and game assets with cross-chain purchasing
+-   Multi-chain cryptocurrency payment support (Starknet, Base, Solana) with chain switching
 -   Traditional payment methods via secure credit card processing
 -   Popular wallet integrations (Argent, MetaMask, Rabby, Phantom)
+-   ERC1155 NFT marketplace support for listing and purchasing digital assets

src/pages/controller/purchasing.md

@@ -11,11 +11,12 @@ Cartridge Controller provides built-in purchase functionality that enables seaml
 
 The purchase system includes:
 
-- **Starterpack Purchases**: Pre-configured bundles of game assets and credits
-- **Credit Purchases**: Direct credit top-ups for gasless transactions
-- **Multichain Payment Support**: Accept payments on Starknet, Ethereum (Base), and Solana
-- **Multiple Wallet Integration**: Support for popular wallets across different ecosystems
+- **Starterpack Purchases**: Pre-configured bundles of game assets and credits with enhanced multichain purchasing flow
+- **Credit Purchases**: Direct credit top-ups for gasless transactions  
+- **Multichain Payment Support**: Accept payments on Starknet, Ethereum (Base), and Solana with seamless cross-chain wallet and network selection
+- **Multiple Wallet Integration**: Support for popular wallets across different ecosystems with chain switching capabilities
 - **Dual Payment Methods**: Both fiat (credit card) and crypto payment options
+- **NFT Marketplace Support**: ERC1155 listing and purchase capabilities for enhanced marketplace functionality
 
 ## Quick Start
 
@@ -112,9 +113,9 @@ The purchase process follows these steps:
 
 1. **Item Selection**: User selects starterpack or credit amount
 2. **Payment Method**: Choose between credit card or cryptocurrency
-3. **Wallet Connection**: For crypto payments, connect external wallet
-4. **Network Selection**: Choose blockchain network for crypto payments
-5. **Transaction Processing**: Complete payment through selected method
+3. **Wallet Connection**: For crypto payments, connect external wallet with automatic chain switching support
+4. **Network Selection**: Choose blockchain network for crypto payments with enhanced cross-chain selection
+5. **Transaction Processing**: Complete payment through selected method with multichain support
 6. **Confirmation**: Receive purchase confirmation and assets
 
 ## Integration Examples

src/pages/controller/signer-management.md

@@ -173,11 +173,21 @@ if (success) {
 If you lose access to your primary authentication method:
 1. Use any other registered signer to access your account
 2. Consider adding additional backup authentication methods
-3. Remove compromised signers if necessary (feature coming soon)
+3. Remove compromised signers using the remove signer functionality
+
+### Removing Signers
+
+You can now remove signers from your account for security or convenience:
+
+1. Navigate to the **Signer(s)** section in Controller Settings
+2. Find the signer you want to remove
+3. Click the **Remove** option for that signer
+4. Confirm the removal when prompted
+
+> **Important**: Ensure you have at least one other working authentication method before removing a signer to avoid losing access to your account.
 
 ### Current Limitations
 
-- **Deletion**: Signer removal functionality is planned but not yet available
 - **Mainnet Only**: Signer management is currently restricted to Mainnet
 - **No Hierarchy**: All signers have equal access; there's no primary/secondary distinction