Remove redundant comment referring to technical debt.

lib/shelley/src/Cardano/Wallet/Shelley/Pools.hs

@@ -415,29 +415,6 @@ combineChainData registrationMap retirementMap prodMap metaMap =
  mRetirementCert =
  Map.lookup (view #poolId registrationCert) retirementMap
 
--- TODO:
---
--- This function currently executes a total of (2n + 1) database queries, where
--- n is the total number of pools with entries in the pool registrations table.
---
--- Specifically:
---
--- 1. We first execute a query to determine the complete set of all pools
--- (including those that may have retired).
---
--- 2. For each pool, we determine its current life-cycle status by executing
--- a pair of queries to fetch:
---
--- a. The most recent registration certificate.
--- b. The most recent retirement certificate.
---
--- This is almost certainly not optimal.
---
--- If performance becomes a problem, we should investigate ways to reduce the
--- number of queries required:
---
--- See: https://jira.iohk.io/browse/ADP-383
---
 readPoolDbData :: DBLayer IO -> EpochNo -> IO (Map PoolId PoolDbData)
 readPoolDbData DBLayer {..} currentEpoch = atomically $ do
  lifeCycleData <- listPoolLifeCycleData currentEpoch