Update example-dnscrypt-proxy.toml (#1489)

* Update lb_strategy usage

* Update example-dnscrypt-proxy.toml

dnscrypt-proxy/example-dnscrypt-proxy.toml

@@ -133,12 +133,15 @@ keepalive = 30
 # blocked_query_response = 'refused'
 
 
-## Load-balancing strategy: 'p2' (default), 'ph', 'first' or 'random'
+## Load-balancing strategy: 'p2' (default), 'ph', 'p<n>', 'first' or 'random'
+## Randomly choose 1 of the fastest 2, half, n, 1 or all live servers by latency.
+## The response quality still depends on the server itself.
 
 # lb_strategy = 'p2'
 
 ## Set to `true` to constantly try to estimate the latency of all the resolvers
 ## and adjust the load-balancing parameters accordingly, or to `false` to disable.
+## Default is `true` that makes 'p2' `lb_strategy` work well.
 
 # lb_estimator = true