Fix a couple of comments

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

tsdb/chunkenc/xor.go

@@ -60,7 +60,7 @@ type XORChunk struct {
 	b bstream
 }
 
-// NewXORChunk returns a new chunk with XOR encoding of the given size.
+// NewXORChunk returns a new chunk with XOR encoding.
 func NewXORChunk() *XORChunk {
 	b := make([]byte, 2, 128)
 	return &XORChunk{b: bstream{stream: b, count: 0}}

tsdb/record/record.go

@@ -543,7 +543,7 @@ func (d *Decoder) FloatHistogramSamples(rec []byte, histograms []RefFloatHistogr
 	return histograms, nil
 }
 
-// Decode decodes a Histogram from a byte slice.
+// DecodeFloatHistogram decodes a Histogram from a byte slice.
 func DecodeFloatHistogram(buf *encoding.Decbuf, fh *histogram.FloatHistogram) {
 	fh.CounterResetHint = histogram.CounterResetHint(buf.Byte())