update vtcombo e2e test

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

go/flags/endtoend/vtcombo.txt

@@ -356,7 +356,7 @@ Flags:
  --topo_consul_lock_delay duration LockDelay for consul session. (default 15s)
  --topo_consul_lock_session_checks string List of checks for consul session. (default "serfHealth")
  --topo_consul_lock_session_ttl string TTL for consul session.
- --topo_consul_max_conns_per_host int Maximum number of consul connections per host.
+ --topo_consul_max_conns_per_host int Maximum number of consul connections per host (default 250).
  --topo_consul_max_idle_conns int Maximum number of idle consul connections. (default 100)
  --topo_consul_watch_poll_duration duration time of the long poll for watch queries. (default 30s)
  --topo_etcd_lease_ttl int Lease TTL for locks and leader election. The client will use KeepAlive to keep the lease going. (default 30)