SDFAB-597 Add topology scaling figure

Change-Id: I7401da7d5433813359229ace323b06e01065824a
diff --git a/specification.rst b/specification.rst
index bfe6c6a..0e21a7b 100644
--- a/specification.rst
+++ b/specification.rst
@@ -89,38 +89,47 @@
 --------
 SD-Fabric can start at the smallest scale (single leaf) and grow horizontally.
 
+.. image:: images/topology-scale.png
+  :width: 900px
+
+
 Single Leaf (ToR)
 -----------------
 This is the minimum SD-Fabric setup. In this setup, all servers are connected to a single switch.
 
 .. image:: images/topology-single.png
+  :width: 160px
 
-Paired Leaf (Dual-Homing)
--------------------------
+Single Leaf Pair (Dual-Homing)
+------------------------------
 Compared to single switch, it provides more redundancy in terms of server NIC failure and link failure.
 
 .. image:: images/topology-pair.png
+  :width: 225px
 
 Leaf-Spine (without pairing)
 ----------------------------
 Compared to single switch, it offers more redundancy in terms of switch failure and provides better scalability.
 
 .. image:: images/topology-2x2.png
+  :width: 300px
 
 Leaf-Spine (with pairing)
 -------------------------
 It supports all the redundancy and scalability features mentioned above.
 
 .. image:: images/topology-2x4.png
+  :width: 450px
 
 Multi-Stage Leaf-Spine
 ----------------------
 Multi-stage is specifically designed for telco service providers.
-The first stage can be installed in the central office,
-while the second stage can be installed in a field office that is closer to the subscribers.
+The first stage can be installed in the central office, while the second stage
+can be installed in a field office that is closer to the subscribers.
 Two stages are typically connected via long distance optical transport.
 
 .. image:: images/topology-full.png
+  :width: 700px
 
 Resiliency
 ----------