Update docs/components/store.md

Co-authored-by: Giedrius Statkevičius <[email protected]>
Signed-off-by: Roy Chiang <[email protected]>

docs/components/store.md

@@ -295,7 +295,7 @@ config:
 
 The **required** settings are:
 
-- `addresses`: list of memcached addresses, that will get resolved with the [DNS service discovery](../service-discovery.md/#dns-service-discovery) provider. If your cluster supports auto-discovery, you should use the flag `auto_discovery` instead.
+- `addresses`: list of memcached addresses, that will get resolved with the [DNS service discovery](../service-discovery.md/#dns-service-discovery) provider. If your cluster supports auto-discovery, you should use the flag `auto_discovery` instead and only point to _one of_ the memcached servers. This typically means that there should be only one address specified that resolves to any of the alive memcached servers. Use this for Amazon ElastiCache and other similar services.
 
 While the remaining settings are **optional**: