Fix link typo.

Change-Id: I182b9c04caddcc4a985f206eddf5c23b06afe0e3
diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index dd5d7a6..8860e0a 100644
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -420,7 +420,7 @@
          * <ul>
          * <li>Content Providers: The default value of {@code android:exported} is now
          * {@code false}. See
-         * <a href="{docRoot}guide/topics/manifest/provider-element.html#exported">
+         * <a href="{@docRoot}guide/topics/manifest/provider-element.html#exported">
          * the android:exported section</a> in the provider documentation for more details.</li>
          * </ul>
          */