Improve docs, fix variable name in error string (#1615)

Author: rcatalan98

claim_contracts/src/AlignedToken.sol

@@ -35,14 +35,15 @@ contract AlignedToken is
     /// @dev The _foundation must accept the ownership of the contract
     /// after deployment in another transaction.
     /// @param _foundation address of the foundation.
-    /// @param _claimSupplier address of the claim supplier.
+    /// @param _claimSupplier address of the claim supplier. This is the address
+    /// that will give the tokens to the users that claim them.
     function initialize(
         address _foundation,
         address _claimSupplier
     ) public initializer {
         require(
             _foundation != address(0) && _claimSupplier != address(0),
-            "Invalid _foundation or _claim"
+            "Invalid _foundation or _claimSupplier"
         );
         __ERC20_init(NAME, SYMBOL);
         __EIP712_init(NAME, VERSION);