cmd/coordinator: change trybot success message

Fixes golang/go#20585

Change-Id: I4208733af69feebb61db846576b19ede290cd5be
Reviewed-on: https://go-review.googlesource.com/45710
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/cmd/coordinator/coordinator.go b/cmd/coordinator/coordinator.go
index 0761af5..5032fb9 100644
--- a/cmd/coordinator/coordinator.go
+++ b/cmd/coordinator/coordinator.go
@@ -1170,7 +1170,7 @@
 				numFail, len(ts.builds), errMsg)
 		}
 		if len(benchResults) > 0 {
-			msg += fmt.Sprintf("\nBenchmark results for %s are available at:\nhttps://perf.golang.org/search?q=cl:%d+try:%s", strings.Join(benchResults, ", "), ts.ci.ChangeNumber, ts.tryID)
+			msg += fmt.Sprintf("\nBenchmark results are available at:\nhttps://perf.golang.org/search?q=cl:%d+try:%s", ts.ci.ChangeNumber, ts.tryID)
 		}
 		if err := gerritClient.SetReview(context.Background(), ts.ChangeTriple(), ts.Commit, gerrit.ReviewInput{
 			Message: msg,