content: fix httpstat link in tracing blog post

Change-Id: I7b9aa56a5c81b8cb31fc5625bf0561a7ebdebab2
Reviewed-on: https://go-review.googlesource.com/30330
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/content/http-tracing.article b/content/http-tracing.article
index 7bd83f0..0e586c5 100644
--- a/content/http-tracing.article
+++ b/content/http-tracing.article
@@ -74,4 +74,4 @@
 for outbound traffic.
 By enabling this new facility, we hope to see HTTP debugging, benchmarking
 and visualization tools from the community — such as
-[[httpstat][https://github.com/davecheney/httpstat]] from Dave Cheney.
+[[https://github.com/davecheney/httpstat][httpstat]] from Dave Cheney.