doubling informations

When a new version of Ubuntu is released, sometimes the \glspl{server} can get clogged up with large numbers of people downloading or upgrading at the same time. If you are familiar with using torrents, you may wish to download the torrent file by clicking ``Alternative download options,'' and obtain your copy of the \acronym{CD} image this way instead. You may see significant improvements to your download speed, and will also be helping to spread Ubuntu to other users worldwide. Again, if you are unsure how to use torrents, you can use the default download options on the website.

Located in ./installation/installation.tex :22
and

\marginnote{\textbf{Torrents} are a way of sharing files and information around the Internet via ``Peer to Peer'' file sharing. When a new version of Ubuntu is released, the Ubuntu servers can become very busy. If you know how to use torrents, we recommend that you download the \acronym{CD} image this way to take the load off the servers during periods of high demand.}

Located in ./installation/installation.tex :24
partially share the same information instead of more explaining what the "torrent" is.

Those are only two (of three) mentions in all manual that mention "torrent". The third is chapter headline.