undo CL 100330043 / e4248ed0037c

<enter reason for undo>

««« original CL description
runtime/race: fix the link for the race detector.

LGTM=bradfitz
R=golang-dev, bradfitz
CC=golang-codereviews
https://golang.org/cl/100330043

»»»

TBR=minux
R=minux.ma
CC=golang-codereviews
https://golang.org/cl/96200044

src/pkg/runtime/race/doc.go

@@ -5,5 +5,5 @@
 // Package race implements data race detection logic.
 // No public interface is provided.
 // For details about the race detector see
-// http://blog.golang.org/race-detector
+// http://golang.org/doc/articles/race_detector.html
 package race