[4.0] Docs: Additional nodeos --help info

[heifner]

Add additional help to transaction-retry-interval-sec & transaction-retry-max-expiration-sec

  --transaction-retry-interval-sec arg (=20)
                                        How often, in seconds, to resend an 
                                        incoming transaction to network if not 
                                        seen in a block.
                                        Needs to be at least twice as large as 
                                        p2p-dedup-cache-expire-time-sec.
  --transaction-retry-max-expiration-sec arg (=120)
                                        Maximum allowed transaction expiration 
                                        for retry transactions, will retry 
                                        transactions up to this value.
                                        Should be larger than 
                                        transaction-retry-interval-sec.

Resolves #1302