Exclude from generated docs

[PMunch]

You could do something like
    
    
    when not defined(nimdoc):
        proc internalOnly*() =
            ## A method that is "package private", but needs to be flagged as
            ## public so the rest of the module can access it. However, it
            ## should not show up in the documentation
            echo "Hello"
    else:
      proc internalOnly() = discard
    
    proc publicApi*() =
        ## Public function that users can call
        internalOnly()
    
    publicApi()
    
    
    Run

That should make it compile as long as you don't use `runnableExamples`.