Update links for all files under sdk/ that moved to studio/

Change-Id: I624621dfd7df0f441d0b559e5a12029e5e299964
diff --git a/docs/html/legal.jd b/docs/html/legal.jd
index 0a68508..8385774 100755
--- a/docs/html/legal.jd
+++ b/docs/html/legal.jd
@@ -17,7 +17,7 @@
 mobile.</p>
 
 <p>To start developing apps for Android, <a
-href="{@docRoot}sdk/index.html">download the free Android SDK</a>.</p>
+href="{@docRoot}studio/index.html">download the free Android SDK</a>.</p>
 
 <h2 id="Brands">Android Brands</h2>