Add the architecture support for both X86_64 and ARM in the overview.rst for second release.

Signed-off-by: Xiaohua Zhang <xiaohua.zhang@windriver.com>
Change-Id: I235f4fcb643c14bca112a28ee941fbdb6c9c31da
diff --git a/docs/overview.rst b/docs/overview.rst
index a00f1be..ea04455 100644
--- a/docs/overview.rst
+++ b/docs/overview.rst
@@ -31,6 +31,9 @@
 2.High performance data plane including the DPDK based vswitch and PCI pass-through/SR-IOV.
 
 
+It will support the X86_64 and ARM.
+
+
 This is based on Yocto/OpenEmbedded, so it includes a Yocto/OpenEmbedded compatible
 layers meta-oran and wrapper scripts to pull all required Yocto/OE layers to build
 out the reference platform.