[mdoc] .Os: What should the argument be?

[Alejandro Colomar]

Hi Ingo,

The current man page for NGINX Unit uses an empty .Os call, probably 
because who wrote it didn't know what better to write there, and since 
it works with it empty, why not.

The current mdoc(7) documentation says this should be the operating 
system and release, but of course, portable programs don't have a 
"operating system", but rather multiple.  So if this is to be used for 
the OS version, it should be empty, and let the OS fill that with the 
default, but that would be useless, the same as Doug pointed out of the 
5th arg to TH.  Then, the only useful thing that this can be used for is 
the project and release, as Branden told me recently for the 4th arg to 
TH; that does make sense.

Could we change the documentation to note that?

Cheers,

Alex

--
<http://www.alejandro-colomar.es/>

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