fix issues reported by gofmt and spelling typo (#3127)

notifier/notifier_test.go

@@ -442,7 +442,7 @@ func TestLabelSetNotReused(t *testing.T) {
 func makeInputTargetGroup() *config.TargetGroup {
 	return &config.TargetGroup{
 		Targets: []model.LabelSet{
-			model.LabelSet{
+			{
 				model.AddressLabel:            model.LabelValue("1.1.1.1:9090"),
 				model.LabelName("notcommon1"): model.LabelValue("label"),
 			},

util/testutil/roundtrip.go

@@ -37,7 +37,7 @@ func (rt *roundTripCheckRequest) RoundTrip(r *http.Request) (*http.Response, err
 }
 
 // NewRoundTripCheckRequest creates a new instance of a type that implements http.RoundTripper,
-// wich before returning theResponse and theError, executes checkRequest against a http.Request.
+// which before returning theResponse and theError, executes checkRequest against a http.Request.
 func NewRoundTripCheckRequest(checkRequest func(*http.Request), theResponse *http.Response, theError error) http.RoundTripper {
 	return &roundTripCheckRequest{
 		checkRequest: checkRequest,