Merge pull request #92 from propeller-heads/ah/docs/clarification-limits

docs: Document the meaning of limits array

evm/src/interfaces/ISwapAdapter.sol

@@ -74,7 +74,9 @@ interface ISwapAdapter is ISwapAdapterTypes {
     /// @param poolId The ID of the trading pool.
     /// @param sellToken The token being sold.
     /// @param buyToken The token being bought.
-    /// @return limits An array of limits.
+    /// @return limits An array of size two indicating the limit amount for the sell
+    ///     token (maximum the pool is willing to buy in sell token) as well as the limit
+    ///     amount of the buy token (maximum the pool is willing to sell in buy token).
     function getLimits(bytes32 poolId, address sellToken, address buyToken)
         external
         returns (uint256[] memory limits);