docs: remove stale ref

tests/reexecute/db.go

@@ -28,9 +28,6 @@ type BlockResult struct {
 // It opens the database at sourceDir and iterates through blocks from startBlock to endBlock (inclusive).
 // Blocks are read sequentially and sent to the returned channel as BlockResult values.
 //
-// cleanup is a function that registers cleanup callbacks and is used to ensure
-// that the database being read from is properly closed prior to the test terminating.
-//
 // Any validation errors or iteration errors are sent as BlockResult with Err set, then the channel is closed.
 func CreateBlockChanFromLevelDB(tc tests.TestContext, sourceDir string, startBlock, endBlock uint64, chanSize int) (<-chan BlockResult, error) {
 	r := require.New(tc)