Awful sentence in "Install ... alongside" step

[Matthew Paul Thomas]

Ubuntu 13.10

1. Start the installer on a system that has another OS installed and at least one tiny partition.
2. Choose "Install Ubuntu 13.10 alongside" whatever, and choose "Continue".

What happens: The next screen says something like
    1 smaller partition is hidden, use the _advanced partitioning tool_ for more control
<https://launchpadlibrarian.net/153861270/new-dividors.png>
<https://launchpadlibrarian.net/153861844/lubuntu-new-dividors.png>

What's wrong with this:
* It's a run-on sentence.
* It says the partition is "hidden" as if it is actually concealed on disk. "Not shown" would be less confusing.
* It refers to an "advanced partitioning tool" as if that is something outside the installer, when it isn't.
* The sentence is missing a period.

<http://goo.gl/4xOlO5>: "If any partitions are too small to be shown, below the chart should be text of the form 'X small partitions totalling Y GB are not shown.', opposite an 'Advanced…' button that switches to the “Allocate disk space” step."

[Matthew Paul Thomas (mpt)]

Specification updated.