[Rd] cutPOSIX - change of help page suggestion (PR#7551)

[petr.pikal at precheza.cz]

Dear R-core people

This is first time I try to send you some suggestion so I hope I use 
the correct address (and sorry if my english is not optimal:-).

cut.POSIX help page says in arguments section:

right, ... arguments to be passed to or from other methods.

which, if I did not encounter following behaviour earlier and did 
not get an answer from r-help, would not help me very much in 
tracking how I can rid of NA from result

> cut(datum[1:5],"day", right=T, include.lowest=T)
[1] 2004-12-06 2004-12-07 2004-12-09 2004-12-12 2004-12-14

> cut(datum[1:5],"day", right=T)
[1] <NA>       2004-12-07 2004-12-09 2004-12-12 2004-12-14

> cut(datum[1:5],"day")
[1] 2004-12-06 2004-12-08 2004-12-10 2004-12-13 <NA>      


I would recommend to add something like:
--------------------------------------------------------------------------
Using both right = TRUE and include.lowest =  TRUE will include 
both ends of your dates range.
--------------------------------------------------------------------------
 
Best regards
Petr Pikal
petr.pikal at precheza.cz