Handle attachment number rows with six child elements

[ttys0dev]

Looks like some of these(like ca1) have six elements.

[ERosendo]

Thanks @ttys0dev, the code looks good!

For future reference, here's an example from ca1 illustrating the attachment table structure:

The attachment table includes a checkbox, attachment number, document link, description, page count, and file size (the 6th element).

[mlissner]

Looks like we just need some release notes and we can merge.

[ERosendo]

@mlissner I'll handle it.