[Rd] Suggestion: Specify default of "pch" in the manual

[Benjamin Hofner]

Both, in the manuals for par() and points() I could not find a note on 
the default value of "pch". I think it would be rather helpful to add a 
note that the default is 1 (in both manuals). This would, for example, 
help users that want to draw a legend.

And yes, I know that one can obtain the default by inspecting par() but 
I think for many users (especially beginneRs) this is not the first 
place to look for such information but the manual is.

    Benjamin