Merge pull request #338 from liammclennan/doc-appinstance-create

Add example signal expression

src/SeqCli/Cli/Commands/AppInstance/CreateCommand.cs

@@ -52,7 +52,7 @@ public CreateCommand(SeqConnectionFactory connectionFactory, SeqCliConfig config
 
         Options.Add(
             "stream:",
-            "Stream incoming events to this app instance as they're ingested; optionally accepts a signal expression limiting which events should be streamed",
+            "Stream incoming events to this app instance as they're ingested; optionally accepts a signal expression limiting which events should be streamed, for example `signal-1,signal-2`",
             s =>
             {
                 _streamIncomingEvents = true;