[exim-dev] Doc fixes

Thanks for the submissions Regid, keep them coming! Unless someone
gets to it before me, I plan on getting to these changes on Monday. I
am a bit locked up this weekend so can't get to it before then.

...Todd

--
The total budget at all receivers for solving senders' problems is $0.
If you want them to accept your mail and manage it the way you want,
send it the way the spec says to. --John Levine