[Rd] Small suggestion for stripchart help

[kwright at eskimo.com]

I needed to look up information about the 'jitter' argument of stripchart.
 When I opened the help page for jitter I found:

jitter 	when jittering is used, jitter gives the amount of jittering applied.

which is slightly confusing/self-referential if you are lazy and don't
read the entire page.

It might be clearer to say

jitter  when \code{method="jitter"} is used, jitter gives the amount of
jittering applied.


Just my opinion.  Thanks for listening.

Kevin Wright