add copyright to xdc.runtime arch doc
diff --git a/src/packages/xdc/runtime/archdocs/xdc_runtime_arch.rst b/src/packages/xdc/runtime/archdocs/xdc_runtime_arch.rst
index 8e87c92..400360b 100644
--- a/src/packages/xdc/runtime/archdocs/xdc_runtime_arch.rst
+++ b/src/packages/xdc/runtime/archdocs/xdc_runtime_arch.rst
@@ -17,6 +17,13 @@
| 0.4 | 3/25/2020 | Added "Uses" diagram and API conventions |
+------------+------------+-------------------------------------------+
+Copyright (c) 2017-2020 Texas Instruments Incorporated. All rights reserved.
+
+Information in this document is subject to change without
+notice. Texas Instruments makes no implied or expressed warranties in
+this document and is not responsible for the products based from this
+document.
+
Introduction
============
