[Rd] R-exts update for new *check* argument in R 3.3.0

[Jan Górecki]

Hello dear dev team,

In the recent devel R-exts manual I cannot find any information about new
option `--ignore-vignettes` to `R CMD check`. I would expect it to be
mentioned somewhere in "1.4.2 Non-Sweave vignettes".

Checked on https://cran.r-project.org/doc/manuals/r-devel/R-exts.html and
https://github.com/wch/r-source/blob/trunk/doc/manual/R-exts.texi

Regards,
Jan Gorecki

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