fix: correct type mismatch in LibVariable documentation example (#725)

Co-authored-by: DaniPopes <[email protected]>

Author: GarmashAlex

src/LibVariable.sol

@@ -48,7 +48,7 @@ enum TypeKind {
 ///                 // string memory notANumber = config.get("important_number").toString();
 ///
 ///                 // Retrieve a address array from the config.
-///                 string[] memory admins = config.get("whitelisted_admins").toAddressArray();
+///                 address[] memory admins = config.get("whitelisted_admins").toAddressArray();
 ///          }
 ///      }
 ///      ```