chore: fix comments on bech32 (backport #18114) (#18117)

Co-authored-by: Marko <[email protected]>

types/bech32/bech32.go

@@ -6,7 +6,7 @@ import (
 	"github.com/cosmos/btcutil/bech32"
 )
 
-// ConvertAndEncode converts from a base64 encoded byte string to base32 encoded byte string and then to bech32.
+// ConvertAndEncode converts from a base256 encoded byte string to base32 encoded byte string and then to bech32.
 func ConvertAndEncode(hrp string, data []byte) (string, error) {
 	converted, err := bech32.ConvertBits(data, 8, 5, true)
 	if err != nil {
@@ -16,7 +16,7 @@ func ConvertAndEncode(hrp string, data []byte) (string, error) {
 	return bech32.Encode(hrp, converted)
 }
 
-// DecodeAndConvert decodes a bech32 encoded string and converts to base64 encoded bytes.
+// DecodeAndConvert decodes a bech32 encoded string and converts to base256 encoded bytes.
 func DecodeAndConvert(bech string) (string, []byte, error) {
 	hrp, data, err := bech32.Decode(bech, 1023)
 	if err != nil {