Patch for adding-application portion of Ubuntu docs

[Simon]

On 6/14/07, Phil Bull <philbull at gmail.com> wrote:
> Looks good! Can I make one small suggestion, though? Could you change
> the following paragraph to use fewer technical terms?
>
> <step><para>For security reasons, you will next need to authenticate
> this software repository using a <emphasis>GPG key</emphasis>.  GPG is
> an algorithm which allows individuals to encrypt and digitally sign
> messages and data.  The GPG key should be available for download on the
> software repository's website.</para>

I don't like the phrase "For security reasons", since it doesn't
actually explain why someone would want to do this. Here's my attempt
at writing the paragraph:

<step><para>
	Most software repositories use a GPG key to digitally sign the files they
	provide, which makes it easy to check that the files haven't been tampered
	with since their creation.  In order for apt to be able to check this, you
	need the public key that corresponds to the signatures.  The key should be
	available for download on the repository's website.
</para>