[ONOS-7998]: Clarify Ambiguity between home and onos_home in TestON topo files

Change-Id: Ie73762d125a9e659d7786a8410f89267f7b79afa
diff --git a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
index 4605185..905d24b 100644
--- a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
+++ b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
@@ -6,6 +6,7 @@
             <password>rocks</password>
             <type>OnosClusterDriver</type>
             <connect_order>1</connect_order>
+            <home></home>   # defines where onos home is on the build machine. Defaults to "~/onos/" if empty.
             <COMPONENTS>
                 <cluster_name></cluster_name>  # Used as a prefix for cluster components. Defaults to 'ONOS'
                 <diff_clihost></diff_clihost> # if it has different host other than localhost for CLI. True or empty. OC# will be used if True.
@@ -15,7 +16,7 @@
                 <web_pass></web_pass>
                 <rest_port></rest_port>
                 <prompt></prompt>  # TODO: we technically need a few of these, one per component
-                <onos_home></onos_home>  # defines where onos home is
+                <onos_home></onos_home>  # defines where onos home is on the target cell machine. Defaults to entry in "home" if empty.
                 <nodes>3</nodes>  # number of nodes in the cluster
             </COMPONENTS>
         </ONOScell>