Added comments

core/celo_multi_gaspool.go

@@ -1,9 +1,6 @@
 package core
 
 import (
-	// "fmt"
-	// "math"
-
 	"github.com/celo-org/celo-blockchain/common"
 )
 
@@ -19,6 +16,8 @@ type MultiGasPool struct {
 
 type FeeCurrencyLimitMapping = map[FeeCurrency]float64
 
+// NewMultiGasPool creates a multi-fee currency gas pool and a default fallback
+// pool for any unconfigured currencies and CELO
 func NewMultiGasPool(
 	block_gas_limit uint64,
 	whitelist []FeeCurrency,
@@ -48,6 +47,8 @@ func NewMultiGasPool(
 	}
 }
 
+// PoolFor returns a configured pool for the given fee currency or the default
+// one otherwise
 func (mgp MultiGasPool) PoolFor(feeCurrency *FeeCurrency) *GasPool {
 	if feeCurrency == nil || mgp.pools[*feeCurrency] == nil {
 		return mgp.defaultPool