FAB-2296 update overview

update overview.rst with content from JIRA
[ci skip]

Change-Id: I203da2f5d3b6c149e1f1e44a16b35401fc12fc8f
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>

docs/source/overview.rst

@@ -1,19 +1,34 @@
 Overview
 ========
 
-**Hyperledger Fabric** is a platform for distributed ledger solutions, underpinned
+Hyperledger Fabric is a platform for distributed ledger solutions, underpinned
 by a modular architecture delivering high degrees of confidentiality, resiliency,
 flexibility and scalability.  It is designed to support pluggable implementations
-of different components, and accomodate the complexity and intricacies that exist 
+of different components, and accomodate the complexity and intricacies that exist
 across the economic ecosystem.
 
-This section provides a high-level overview of key Fabric concepts:
-
-* :ref:`Assets`
-* :ref:`Chaincode`
-* :ref:`Ledger-Features`
-* :ref:`Privacy-through-Channels`
-* :ref:`Security-Membership-Services`
-* :ref:`Consensus`
+Hyperledger Fabric delivers a uniquely elastic and extensible architecture,
+distinguishing it from alternative blockchain solutions. Planning for the
+future of enterprise blockchain requires building on top of a fully-vetted,
+open source architecture; Hyperledger Fabric is your starting point.
 
+The key design features woven into Hyperledger Fabric fulfill its promise of a
+comprehensive, yet customizable, enterprise blockchain solution:
 
+* :ref:`Assets` - Asset definitions enable the exchange of almost anything with
+monetary value over the network, from whole foods to antique cars to currency
+futures.
+* :ref:`Chaincode`  Chaincode execution is partitioned from transaction ordering,
+limiting the required levels of trust and verification across node types, and
+optimizing network scalability and performance.
+* :ref:`Ledger-Features` - The immutable, shared ledger encodes the entire
+transaction history for each channel, and includes SQL-like query capability
+for efficient auditing and dispute resolution.
+* :ref:`Privacy-through-Channels` - Channels enable multi-lateral transactions
+with the high degrees of privacy and confidentiality required by competing
+businesses and regulated industries that exchange assets on a common network.
+* :ref:`Security-Membership-Services` - Permissioned membership provides a
+trusted blockchain network, where participants know that all transactions can
+be detected and traced by authorized regulators and auditors.
+* :ref:`Consensus` - Fabric's unique approach to consensus enables the
+flexibility and scalability needed for the enterprise.