[Rd] fix type explanation in plot.default

[Manuel López-Ibáñez]

The explanation of the 'type' parameter of plot.default is a bit confusing, 
plus the stray closing parenthesis. I suggest the following small change to 
match the one given in plot. Feel free to adjust at your convenience.

Apply to http://svn.r-project.org/R/trunk/src/library/graphics/man/plot.default.Rd

Cheers,
	Manuel.



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