Rails - May 2014 - link_to with array parameter for URL : What does it mean?

(Crossposting Note: This topic has been posted already at
https://railsforum.com/topic/1933-link-to-with-array-parameter-for-url-what-does-it-mean
, but did not get a reply so far)

I found in http://guides.rubyon...-a-partial-form the following example:

link_to 'Destroy Comment', [comment.article, comment], method: :delete,
data: { confirm: 'Are you sure?' }

I was surprised to see an array as second parameter for link_to and
would like to know the meaning of this construct. The website gives just
the somewhat thin explanation Clicking this new "Destroy Comment" link
will fire off a DELETE /articles/:article_id/comments/:id to our
CommentsController, which explains the effect of this statement, but
does not really explain the general mechanism behind this concept. I've
looked up the API documentation at http://api.rubyonrails.org/, which
gives for the second parameter of link_to the following choices (for the
case that the first parameter is a string):

 A string containing the URL to link to, or
 A hash containing various options for the URL
An array as parameter is not mentioned. It seems that the API
documentation is not complete here. Or did I look at the wrong place?

Please could someone explain this syntax to me, and also point out,
where I can find a more detailed description of the API?

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