Add documents for /server

save/chunk_test.go

@@ -27,7 +27,7 @@ func TestColumn(t *testing.T) {
 }
 
 func BenchmarkColumn_Load(b *testing.B) {
-	// Test how many time we load a chunk
+	// Test how many times we load a chunk
 	var c Column
 	r, err := region.Open("testdata/region/r.-1.-1.mca")
 	if err != nil {

save/palette.go

@@ -13,8 +13,8 @@ type BlockState interface {
 type palette interface {
 	id(v BlockState) int
 	value(i int) BlockState
-	io.ReaderFrom
-	io.WriterTo
+	pk.FieldEncoder
+	pk.FieldDecoder
 	read(r nbt.DecoderReader) (int, error)
 }