Fix a couple of links in runtime/observatory

runtime/observatory/lib/src/elements/view_footer.dart

Index: runtime/observatory/lib/src/elements/view_footer.dart
diff --git a/runtime/observatory/lib/src/elements/view_footer.dart b/runtime/observatory/lib/src/elements/view_footer.dart
index f85b1d963709d8b21e24b2d1aed4fae4615fd92c..cd8cd94662004afa252d32494e315112dc37e2c3 100644
--- a/runtime/observatory/lib/src/elements/view_footer.dart
+++ b/runtime/observatory/lib/src/elements/view_footer.dart
@@ -40,7 +40,7 @@ class ViewFooterElement extends HtmlElement implements Renderable {
   void render() {
     children = [
       new AnchorElement()
-        ..href = 'https://www.dartlang.org/tools/observatory'
+        ..href = 'https://dart-lang.github.io/observatory/'
         ..text = 'View documentation',
       new AnchorElement()
         ..href =