Update comment.

Signed-off-by: Mark D. Roth <[email protected]>

api/envoy/api/v2/cds.proto

@@ -661,7 +661,8 @@ message Cluster {
   // [#not-implemented-hide:]
   // If present, tells the client where to send load reports via LRS. If not present, the
   // client will fall back to a client-side default, which may be either (a) don't send any
-  // load reports or (b) send load reports for all clusters to a single default server.
+  // load reports or (b) send load reports for all clusters to a single default server
+  // (which may be configured in the bootstrap file).
   //
   // Note that if multiple clusters point to the same LRS server, the client may choose to
   // create a separate stream for each cluster or it may choose to coalesce the data for