Fix broken link on github SDK front page

R=kmillikin@google.com
BUG=

Review-Url: https://codereview.chromium.org/2609003002 .
diff --git a/README.md b/README.md
index e2a2f1e..8799041 100644
--- a/README.md
+++ b/README.md
@@ -14,8 +14,9 @@
 
 ## Building Dart
 
-Learn how to [get the source](https://github.com/dart-lang/sdk/wiki/Building#getting-the-source)
-and [prepare your machine to build the SDK](https://github.com/dart-lang/sdk/wiki/Preparing-your-machine-to-build-the-Dart-SDK).
+If you want to build Dart yourself, here is a guide to
+[getting the source, preparing your machine to build the SDK, and
+building](https://github.com/dart-lang/sdk/wiki/Building).
 
 There are more documents on our [wiki](https://github.com/dart-lang/sdk/wiki).