[tz] [PROPOSED] Cite Rec. ITU-R TF.460-6 for leap seconds

[Paul Eggert]

Steve Allen wrote:
>> +  print "# (a proxy for Earth's angle in space corrected for polar motion)"
> That's a 1950s-lingo explanation

Thanks for the review. I cribbed that "polar motion" from Levine's 2016 article 
- I wonder what dusty old paper he got it from? Anyway, I installed the attached 
to try to improve the language. We needn't go into details like CIO, TIO, etc. 
since this file is about leap seconds not UT1.
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