misc: remove and update TODO and NOTES

Author: abarmat

contracts/curation/Curation.sol

@@ -214,8 +214,9 @@ contract Curation is CurationV1Storage, GraphUpgradeable, ICuration {
 
             // If no signal token for the pool - create one
             if (address(curationPool.gcs) == address(0)) {
-                // TODO: the gas cost of deploying the subgraph token can be greatly optimized
-                // by deploying a proxy each time, sharing the same implementation
+                // TODO: Use a minimal proxy to reduce gas cost
+                // https://github.com/graphprotocol/contracts/issues/405
+                // --abarmat-- 20201113
                 curationPool.gcs = IGraphCurationToken(
                     address(new GraphCurationToken(address(this)))
                 );

contracts/rewards/RewardsManager.sol

@@ -291,9 +291,6 @@ contract RewardsManager is RewardsManagerV1Storage, GraphUpgradeable, IRewardsMa
      * Must be called before allocation on a subgraph changes.
      * NOTE: Hook called from the Staking contract on allocate() and close()
      *
-     * TODO: Some staticcalls can be optimized by making the Staking contract pass
-     * more information in the call
-     *
      * @param _subgraphDeploymentID Subgraph deployment
      * @return Accumulated rewards per allocated token for a subgraph
      */