cmd/compilebench: fix package name in comment

Change-Id: Ie5c413fc9f13cf029d8d8a6cae5754838c834395
Reviewed-on: https://go-review.googlesource.com/40170
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/cmd/compilebench/main.go b/cmd/compilebench/main.go
index 3072a11..8a2e73f 100644
--- a/cmd/compilebench/main.go
+++ b/cmd/compilebench/main.go
@@ -9,7 +9,7 @@
 //	compilebench [options]
 //
 // It times the compilation of various packages and prints results in
-// the format used by package testing (and expected by rsc.io/benchstat).
+// the format used by package testing (and expected by golang.org/x/perf/cmd/benchstat).
 //
 // The options are:
 //