File#directory? docs

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Hi,

I just noticed for the first time that if you have a symlink, say
"foo", that points at a directory, both

  File.symlink? 'foo'

and

  File.directory? 'foo'

return true. While this is a bit misleading in my opinion, it should
definitely be documented in File.directory?. So here's a tiny little
patch against trunk that documents this caveat in File#directory?.
What do you think?

-- 
Ilkka

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