[Bug 19406] Change "screen readers" example to "printers"

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19406

Bug 19406 depends on bug 19405, which changed state.

Bug 19405 Summary: Clarify focusability of hidden="" content
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19405

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

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