Review comments on PDF12

In the test procedure,
* Change "For each form control," to "For the form control"
* Modify the 2nd option to read "Use a tool capable of showing the form
field information to open the PDF document and verify that the form control
has the correct name, role, value, and state (if appropriate) information."

Both of the tables have a bit of a mixture of information about PDF and
information about how Adobe Acrobat exposes that information in its UI. Is
there a way we can either label things more clearly, or separate the PDF
information from the Acrobat UI information? For instance, we may need to
split the information in the Comments column of the first table, or possibly
just relabel it so that it is clearer that it is describing how to access
that field in Acrobat.