[datatable-help] setkey() docs out of date

[Muhammad Waliji]

According to ?setkey, setkey() doesn't return any value.  However, this was
changed as of 1.6.5.
https://r-forge.r-project.org/scm/viewvc.php/pkg/man/setkey.Rd?view=markup&root=datatable
https://r-forge.r-project.org/scm/viewvc.php/pkg/NEWS?view=markup&root=datatable

Could be a bit confusing.

Best,
Muhammad
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