Remove extra comments and fix one comment to use credential instead o…

…f builder

xds/bootstrap/bootstrap.go

@@ -37,7 +37,7 @@ var registry = make(map[string]Credentials)
 // Credentials interface encapsulates a credentials.Bundle builder
 // that can be used for communicating with the xDS Management server.
 type Credentials interface {
-	// Build returns a credential bundle associated with the Builder.
+	// Build returns a credential bundle associated with this credential.
 	Build(config json.RawMessage) (credentials.Bundle, error)
 	// Name returns the credential name associated with this credential.
 	Name() string

xds/internal/xdsclient/bootstrap/bootstrap.go

@@ -69,13 +69,9 @@ var bootstrapFileReadFunc = ioutil.ReadFile
 // JSON config.
 type insecureCredsBuilder struct{}
 
-// Build returns a default insecure credential bundle. Currently the JSON
-// config is unused.
 func (i *insecureCredsBuilder) Build(_ json.RawMessage) (credentials.Bundle, error) {
 	return insecure.NewBundle(), nil
 }
-
-// Name returns the name associated with CredsBuilder i.e. "insecure".
 func (i *insecureCredsBuilder) Name() string {
 	return "insecure"
 }
@@ -84,13 +80,10 @@ func (i *insecureCredsBuilder) Name() string {
 // JSON config.
 type googleDefaultCredsBuilder struct{}
 
-// Build returns a default google credential bundle. Currently the JSON
-// config is unused.
 func (d *googleDefaultCredsBuilder) Build(_ json.RawMessage) (credentials.Bundle, error) {
 	return google.NewDefaultCredentials(), nil
 }
 
-// Name returns the name associated with googleDefaultCredsBuilder i.e. "google_default".
 func (d *googleDefaultCredsBuilder) Name() string {
 	return "google_default"
 }