[haiku-doc] suggested changes for _app_intro.dox

I think this will read better to a native english speaker (or at least 
a native American speaker ;) without losing the original ideas or 
intent.  If this is acceptable, please feel free to suggest other 
documents I can look at.  I would eventually like to learn Doxygen well 
enough to start filling in some missing parts.  I know some C++ and am 
interested in having the docs for myself, so pitching in seemed like 
the thing to do.

Hopefully this works, I have not used the Haiku Mail program before...

--TimH

<<< application/x-be_attribute; name="BeOS Attributes": Unrecognized >>>

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