talks: gomobile init doesn't install Android SDK

It might be confusing to say gomobile simplifies SDK installation.
Because it doesn't install Android SDK.

It downloads a stripped version of Android NDK and builds the
android/arm cross compiler.

In order to use gomobile install, users still need to install adb
through Android SDK or find a standalone adb distribution.

Change-Id: Idc9338ee96c62cf48bf92d4c08356e2e2b2f0670
Reviewed-on: https://go-review.googlesource.com/10369
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/2015/state-of-go-may.slide b/2015/state-of-go-may.slide
index dcfcb90..aa90188 100644
--- a/2015/state-of-go-may.slide
+++ b/2015/state-of-go-may.slide
@@ -254,7 +254,8 @@
 
 * The gomobile tool
 
-The `gomobile` tool simplifies SDK installation and app deployment.
+The `gomobile` tool simplifies toolchain installation and app
+deployment.
 (It only supports Android right now.)
 
 To install the Android compiler toolchain: