chore: fix some typos in comments

Signed-off-by: writegr <wellweek@outlook.com>

app/router/config.pb.go

@@ -864,7 +864,7 @@ type StrategyLeastLoadConfig struct {
 	Baselines []int64 `protobuf:"varint,3,rep,packed,name=baselines,proto3" json:"baselines,omitempty"`
 	// expected nodes count to select
 	Expected int32 `protobuf:"varint,4,opt,name=expected,proto3" json:"expected,omitempty"`
-	// max acceptable rtt, filter away high delay nodes. defalut 0
+	// max acceptable rtt, filter away high delay nodes. default 0
 	MaxRTT int64 `protobuf:"varint,5,opt,name=maxRTT,proto3" json:"maxRTT,omitempty"`
 	// acceptable failure rate
 	Tolerance float32 `protobuf:"fixed32,6,opt,name=tolerance,proto3" json:"tolerance,omitempty"`

app/router/config.proto

@@ -147,7 +147,7 @@ message StrategyLeastLoadConfig {
   repeated int64 baselines = 3;
   // expected nodes count to select
   int32 expected = 4;
-  // max acceptable rtt, filter away high delay nodes. defalut 0
+  // max acceptable rtt, filter away high delay nodes. default 0
   int64 maxRTT = 5;
   // acceptable failure rate
   float tolerance = 6;

infra/conf/router_strategy.go

@@ -38,7 +38,7 @@ type strategyLeastLoadConfig struct {
 	Baselines []duration.Duration `json:"baselines,omitempty"`
 	// expected nodes count to select
 	Expected int32 `json:"expected,omitempty"`
-	// max acceptable rtt, filter away high delay nodes. defalut 0
+	// max acceptable rtt, filter away high delay nodes. default 0
 	MaxRTT duration.Duration `json:"maxRTT,omitempty"`
 	// acceptable failure rate
 	Tolerance float64 `json:"tolerance,omitempty"`