chore: update comment (#2747)

Co-authored-by: haiyux <haiyux@foxmail.com>

contrib/registry/servicecomb/watcher.go

@@ -1,8 +1,9 @@
 package servicecomb
 
 import (
+	"context"
+
 	"github.com/go-chassis/sc-client"
-	"golang.org/x/net/context"
 
 	"github.com/go-kratos/kratos/v2/registry"
 )

selector/p2c/p2c.go

@@ -13,16 +13,16 @@ import (
 
 const (
 	forcePick = time.Second * 3
-	// Name is balancer name
+	// Name is p2c(Pick of 2 choices) balancer name
 	Name = "p2c"
 )
 
 var _ selector.Balancer = (*Balancer)(nil)
 
-// Option is random builder option.
+// Option is p2c builder option.
 type Option func(o *options)
 
-// options is random builder options
+// options is p2c builder options
 type options struct{}
 
 // New creates a p2c selector.

selector/wrr/wrr.go

@@ -9,19 +9,19 @@ import (
 )
 
 const (
-	// Name is wrr balancer name
+	// Name is wrr(Weighted Round Robin) balancer name
 	Name = "wrr"
 )
 
 var _ selector.Balancer = (*Balancer)(nil) // Name is balancer name
 
-// Option is random builder option.
+// Option is wrr builder option.
 type Option func(o *options)
 
-// options is random builder options
+// options is wrr builder options
 type options struct{}
 
-// Balancer is a random balancer.
+// Balancer is a wrr balancer.
 type Balancer struct {
 	mu            sync.Mutex
 	currentWeight map[string]float64