[MERGE] Add some more text to the --rio option help in version-info.

[John Arbash Meinel]

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James Westby wrote:
> This text gives a clue about what RIO format is, and also notes that
> it is the default.
> 
> The patch is from  Wesley J. Landaker in
> https://bugs.launchpad.net/bugs/195560
> 
> Thanks,
> 
> James
> 
> 
bb:approve

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