ref(TrafficTarget): update requirements for TrafficTarget

Signed-off-by: Michelle Noorali <michellemolu@gmail.com>
servicemeshinterface · Oct 14, 2020 · e99b011 · e99b011
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diff --git a/apis/traffic-access/traffic-access-WD.md b/apis/traffic-access/traffic-access-WD.md
@@ -36,6 +36,9 @@ define what traffic for specific protocols would look like. The kind can be
 different depending on what traffic a target is serving. In the following
 examples, `HTTPRouteGroup` is used for applications serving HTTP based traffic.
 
+A valid `TrafficTarget` must specify a destination, at least one rule, and
+at least one source.
+
 To understand how this all fits together, first define the routes for some
 traffic.