Fix minor typos in comments

encoding_helpers.go

@@ -11,7 +11,7 @@ import (
 
 var errInvalidSize = errors.New("invalid size")
 
-// enbuf is a helper type to populate a byte slice with various types.
+// encbuf is a helper type to populate a byte slice with various types.
 type encbuf struct {
 	b []byte
 	c [binary.MaxVarintLen64]byte

querier.go

@@ -117,7 +117,7 @@ func (q *querier) Close() error {
 	return merr.Err()
 }
 
-// NewBlockQuerier returns a queries against the readers.
+// NewBlockQuerier returns a querier against the reader.
 func NewBlockQuerier(b BlockReader, mint, maxt int64) (Querier, error) {
 	indexr, err := b.Index()
 	if err != nil {