*: fix "raftIndex" comment as "committed index"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

Documentation/dev-guide/api_reference_v3.md

@@ -787,7 +787,7 @@ Empty field.
 | version | version is the cluster protocol version used by the responding member. | string |
 | dbSize | dbSize is the size of the backend database physically allocated, in bytes, of the responding member. | int64 |
 | leader | leader is the member ID which the responding member believes is the current leader. | uint64 |
-| raftIndex | raftIndex is the current raft index of the responding member. | uint64 |
+| raftIndex | raftIndex is the current raft committed index of the responding member. | uint64 |
 | raftTerm | raftTerm is the current raft term of the responding member. | uint64 |
 | raftAppliedIndex | raftAppliedIndex is the current raft applied index of the responding member. | uint64 |
 | errors | errors contains alarm/health information and status. | (slice of) string |

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -2196,7 +2196,7 @@
           "format": "uint64"
         },
         "raftIndex": {
-          "description": "raftIndex is the current raft index of the responding member.",
+          "description": "raftIndex is the current raft committed index of the responding member.",
           "type": "string",
           "format": "uint64"
         },

etcdserver/etcdserverpb/rpc.pb.go

@@ -2440,7 +2440,7 @@ type StatusResponse struct {
 	DbSize int64 `protobuf:"varint,3,opt,name=dbSize,proto3" json:"dbSize,omitempty"`
 	// leader is the member ID which the responding member believes is the current leader.
 	Leader uint64 `protobuf:"varint,4,opt,name=leader,proto3" json:"leader,omitempty"`
-	// raftIndex is the current raft index of the responding member.
+	// raftIndex is the current raft committed index of the responding member.
 	RaftIndex uint64 `protobuf:"varint,5,opt,name=raftIndex,proto3" json:"raftIndex,omitempty"`
 	// raftTerm is the current raft term of the responding member.
 	RaftTerm uint64 `protobuf:"varint,6,opt,name=raftTerm,proto3" json:"raftTerm,omitempty"`

etcdserver/etcdserverpb/rpc.proto

@@ -903,7 +903,7 @@ message StatusResponse {
   int64 dbSize = 3;
   // leader is the member ID which the responding member believes is the current leader.
   uint64 leader = 4;
-  // raftIndex is the current raft index of the responding member.
+  // raftIndex is the current raft committed index of the responding member.
   uint64 raftIndex = 5;
   // raftTerm is the current raft term of the responding member.
   uint64 raftTerm = 6;