[datatable-help] Minor correction in help file

[Matthew Dowle]

Thanks, yes. j and by descriptions now improved in ?data.table.

On Tue, 2012-01-10 at 17:35 -0500, Joseph Voelkel wrote:
> In ?data.table
> 
>  
> 
> “j is evaluated within the frame of the data.table (i.e. it sees
> column names as if they are variables). The result is returned. list()
> may be omitted when there is just one expression, for convenience.”
> 
>  
> 
> I think these used to be identical (?), but now one returns a vector
> and the other a data.table.  
> 
> 
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