Clarify VaultUnlocked placeholder format in documentation and update callout description

Author: NonSwag

content/docs/serviceio/placeholders.mdx

@@ -56,7 +56,7 @@ All ServiceIO placeholders follow the format:
 
 ### VaultUnlocked Compatibility
 
-ServiceIO also provides VaultUnlocked-compatible placeholders using the `%vaultunlocked_*%` format for compatibility reasons:
+ServiceIO also provides VaultUnlocked placeholders using the `%vaultunlocked_<placeholder>%` format for compatibility reasons:
 
 - `%vaultunlocked_balance%` - Player's balance
 - `%vaultunlocked_balance_<world>%` - Balance in a specific world
@@ -66,7 +66,7 @@ ServiceIO also provides VaultUnlocked-compatible placeholders using the `%vaultu
 - `%vaultunlocked_accounts_count%` - Number of accounts the player belongs to
 
 <Callout type="info" title="VaultUnlocked Placeholders">
-  VaultUnlocked placeholders provide advanced multi-currency and account management features. See the [VaultUnlocked documentation](https://github.com/TheNewEconomy/VaultUnlocked?tab=readme-ov-file#-vaultunlocked-placeholderapi-placeholders-uuid-based) for the complete list of available placeholders.
+  See the [VaultUnlocked documentation](https://github.com/TheNewEconomy/VaultUnlocked?tab=readme-ov-file#-vaultunlocked-placeholderapi-placeholders-uuid-based) for the complete list of available placeholders.
 </Callout>
 
 ## Usage Examples