update PutAppend spec

src/kvraft/server.go

@@ -1,12 +1,13 @@
 package kvraft
 
 import (
-	"6.5840/labgob"
-	"6.5840/labrpc"
-	"6.5840/raft"
 	"log"
 	"sync"
 	"sync/atomic"
+
+	"6.5840/labgob"
+	"6.5840/labrpc"
+	"6.5840/raft"
 )
 
 const Debug = false
@@ -18,7 +19,6 @@ func DPrintf(format string, a ...interface{}) (n int, err error) {
 	return
 }
 
-
 type Op struct {
 	// Your definitions here.
 	// Field names must start with capital letters,
@@ -37,11 +37,12 @@ type KVServer struct {
 	// Your definitions here.
 }
 
-
 func (kv *KVServer) Get(args *GetArgs, reply *GetReply) {
 	// Your code here.
 }
 
+// unlike in lab 2, neither Put nor Append should return a value.
+// this is already reflected in the PutAppendReply struct.
 func (kv *KVServer) PutAppend(args *PutAppendArgs, reply *PutAppendReply) {
 	// Your code here.
 }