documentation for using guard in the PDP

Added guardpdp.rst and minor updates to other documentation.
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Change-Id: If0d430cdff3b9b1700b773b78c3d951698609714
Issue-Id: POLICY-335
Signed-off-by: Saryu Shah <ss3917@att.com>
diff --git a/docs/platform/offeredapis.rst b/docs/platform/offeredapis.rst
index 8d4cfeb..811a128 100644
--- a/docs/platform/offeredapis.rst
+++ b/docs/platform/offeredapis.rst
@@ -45,5 +45,5 @@
 
 
 
-End of document
+End of Document