Revert "fixed comment"

This reverts commit c3d7bff.

src/contracts/libraries/BeaconChainProofs.sol

@@ -325,9 +325,11 @@ library BeaconChainProofs {
 
         {
             /**
-             * Next we verify the withdrawal fields against the executionPayloadRoot:
-             * First we compute the withdrawal_index, then we merkleize the 
-             * withdrawalFields container to calculate the the withdrawalRoot.
+             * Next we verify the withdrawal fields against the blockRoot:
+             * First we compute the withdrawal_index relative to the blockRoot by concatenating the indexes of all the
+             * intermediate root indexes from the bottom of the sub trees (the withdrawal container) to the top, the blockRoot.
+             * Then we calculate merkleize the withdrawalFields container to calculate the the withdrawalRoot.
+             * Finally we verify the withdrawalRoot against the executionPayloadRoot.
              *
              *
              * Note: Merkleization of the withdrawals root tree uses MerkleizeWithMixin, i.e., the length of the array is hashed with the root of