misc updates to tools information in setup and test docs

Change-Id: Ie0e20a207fa8cf0064459acacedb87c0e38c0c40
diff --git a/docs/html/preview/setup-sdk.jd b/docs/html/preview/setup-sdk.jd
index 29a9fa7..b60e27a 100644
--- a/docs/html/preview/setup-sdk.jd
+++ b/docs/html/preview/setup-sdk.jd
@@ -191,7 +191,7 @@
 <pre>
 android {
   compileSdkVersion <strong>'android-N'</strong>
-  buildToolsVersion <strong>24.0.0</strong>
+  buildToolsVersion <strong>24.0.0 rc1</strong>
   ...
 
   defaultConfig {