Highlight TiaB

Change-Id: Ic569ad42dfd7ec92783e189b907645a4be0deebe
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 Trellis in a Box (TiaB)
 =======================
-Trellis in a Box (TiaB) is a software emulated environment that allows people to run Trellis without hardware switches.
-It is the most convenient and **recommended option for beginners who would like to quickly get some hands on experience** of Trellis.
-It is also useful for developers who would like to easily verify their code in early development stages.
+TiaB is a software emulated environment that allows people to run Trellis without hardware switches.
+TiaB comes with a few Mininet scripts that emulate network topology from a simple 2x2 leaf-spine to a full multi-stage fabric.
+The configurations corresponding to each topology are also packaged together such that you can start the environment right away.
 
 TiaB is currently hosted in a GitHub repository separated from ONOS.
 The source code and user guide of TiaB can be found `here <https://github.com/opennetworkinglab/routing/tree/master/trellis>`_.
 
+.. tip::
+    TiaB is the most convenient and **recommended option for beginners who would like to quickly get some hands on experience** of Trellis.
+
 
 Hardware Requirements
 =====================