[Rd] vfont and title() (PR#7031)

[gregory_r_warnes at groton.pfizer.com]

The "Hershey" help page  states:

     If the 'vfont' argument to one of the text-drawing functions
     ('text', 'mtext', 'title', 'axis', and 'contour') is a character
     vector of length 2, Hershey vector fonts are used to render the
     text.

However, title() issues warnings and does not use the vfont information if
provided:

> title(main="test",vfont=c("sans serif","bold"))
NULL
Warning message: 
parameter "vfont" couldn't be set in high-level plot() function 
>

-Greg

Gregory R. Warnes
Manager, Non-Clinical Statistics
Pfizer Global Research and Development



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