Apply suggestions from code review

Co-authored-by: Max Inden <[email protected]>

client/network/src/service.rs

@@ -187,10 +187,11 @@ impl<B: BlockT + 'static, H: ExHashT> NetworkWorker<B, H> {
 			};
 			if print_deprecated_message {
 				log::warn!(
-					"🙇 Sentry nodes are deprecated for the time being, and the `--sentry` and
-					`--sentry-nodes` CLI options will be removed in a future version. The Substrate
+					"🙇 Sentry nodes are deprecated, and the `--sentry` and
+					`--sentry-nodes` CLI options will eventually be removed in a future version. The Substrate
 					and Polkadot networking protocol require validators to be publicly-accessible.
-					Please do not block access to your validator nodes."
+					Please do not block access to your validator nodes.
+					For details see https://github.com/paritytech/substrate/issues/6845.
 				);
 			}