Patch for Struct::new documentation

All,

I've attached a patch for the documentation for
Struct::new.

The second edition of The Pickaxe Book says:

> Ruby 1.9 and later allow you to pass a block to a
Struct's constructor.
> This block is evaluated in the context of the new
struct's class and hence
> allows you conveniently to add instance methods to the
new struct.

It turns out that this functionality has actually been
present since 1.8.3!
This is the relevant ChangeLog entry:

http://svn.ruby-lang.org/cgi-bin/view
vc.cgi/trunk/struct.c?view=log#rev5934

(although it references [ruby-talk:02606], it should really
be
[ruby-core:02606]:

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/rub
y/ruby-core/2606

I've tried to stick to the submission guidelines, but please
let me know if
I've screwed anything up!

Cheers,

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