Move 'Versioning' topic from overview to download page.

native_client_sdk/src/doc/sdk/download.rst

Index: native_client_sdk/src/doc/sdk/download.rst
diff --git a/native_client_sdk/src/doc/sdk/download.rst b/native_client_sdk/src/doc/sdk/download.rst
index ea0d27134974648be48aa58329178c0575482d35..a52ea509a4bfda9af22d95c03d71b83841afee06 100644
--- a/native_client_sdk/src/doc/sdk/download.rst
+++ b/native_client_sdk/src/doc/sdk/download.rst
@@ -73,6 +73,21 @@ Make
   <https://github.com/kennethreitz/osx-gcc-installer>`_.
 * On Windows, the Native Client SDK includes a copy of GNU Make.
 
+.. _versioning:
+
+Versioning
+----------
+
+Chrome is released on a six week cycle, and developer versions of Chrome are
+pushed to the public beta channel three weeks before each release. As with any
+software, each release of Chrome may include changes to Native Client and the
+Pepper interfaces that may require modification to existing applications.
+However, modules compiled for one version of Pepper/Chrome should work with
+subsequent versions of Pepper/Chrome. The SDK includes multiple versions of the
+Pepper APIs to help developers make adjustments to API changes and take
+advantage of new features: `stable </native-client/pepper_stable>`_, `beta
+</native-client/pepper_beta>`_ and `dev </native-client/pepper_dev>`_.
+
 .. _installing-the-sdk:
 
 Installing the SDK