rand: make function comment match function name

Change-Id: Idfa75f2dcf2723be396dabd8241c4f1df762e9c2
Reviewed-on: https://go-review.googlesource.com/c/exp/+/639557
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/rand/regress_test.go b/rand/regress_test.go
index e3a8f6e..815bed0 100644
--- a/rand/regress_test.go
+++ b/rand/regress_test.go
@@ -23,7 +23,7 @@
 
 var printgolden = flag.Bool("printgolden", false, "print golden results for regression test")
 
-// TestSource verifies that the output of the default Source is locked down.
+// TestSourceRegress verifies that the output of the default Source is locked down.
 func TestSourceRegress(t *testing.T) {
 	src := NewSource(1)
 	var got [20]uint64