Fixes to F# Publish/Subscribe Example
Fixes to F# Publish/Subscribe Example

Fixed Publish/Subscribe example code to use the correct "IActorRef" type instead of "ActorRef" (failed to compile). Added sleep delay and comments about race condition (example does not always behave as expected otherwise, and may be confusing to users).
akkadotnet/getakka.net,sean-gilliam/getakka.net,sean-gilliam/getakka.net,akkadotnet/getakka.net