Fix a few comment typos.

blockheader.go

@@ -14,7 +14,7 @@ import (
 const BlockVersion uint32 = 2
 
 // Version 4 bytes + Timestamp 4 bytes + Bits 4 bytes + Nonce 4 bytes +
-// TxnCount (varInt) + PrevBlock and MarkleRoot hashes.
+// TxnCount (varInt) + PrevBlock and MerkleRoot hashes.
 const maxBlockHeaderPayload = 16 + maxVarIntPayload + (HashSize * 2)
 
 // BlockHeader defines information about a block and is used in the bitcoin

common_test.go

@@ -22,7 +22,7 @@ type fakeRandReader struct {
 }
 
 // Read returns the fake reader error and the lesser of the fake reader value
-// and the length p.
+// and the length of p.
 func (r *fakeRandReader) Read(p []byte) (int, error) {
 	n := r.n
 	if n > len(p) {

msgblock.go

@@ -104,7 +104,6 @@ func (msg *MsgBlock) BtcDecodeTxLoc(r *bytes.Buffer, pver uint32) ([]TxLoc, erro
 // BtcEncode encodes the receiver to w using the bitcoin protocol encoding.
 // This is part of the Message interface implementation.
 func (msg *MsgBlock) BtcEncode(w io.Writer, pver uint32) error {
-	// XXX: Max transactions?
 	msg.Header.TxnCount = uint64(len(msg.Transactions))
 
 	err := writeBlockHeader(w, pver, &msg.Header)