[Rd] Patch for minor typo in legend.Rd

[Gavin Simpson]

There is a typo in a comment in the example section of legend.Rd, line
224. The comment refers the reader to 'example(plotfactor)'. It should
read 'example(plot.factor)'

The attached patch (against R 2.8.0 to be r45988) makes this change to
legend.Rd.

All the best,

G
-- 
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 Dr. Gavin Simpson             [t] +44 (0)20 7679 0522
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