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

(Crossposting Note: This topic has been posted already at
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 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 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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