doc: Explain that apt-get download ensures package authenticity

The documentation currently does not specify whether `apt-get download`
verifies the authenticity of downloaded packages or not. The underlying
code does verify the authenticity of packages as usual and would fail if
the package signature is invalid. Therefore it makes sense to make this
guarantee explicit in the documentation, because without it
security-conscious users will likely want to recheck the signatures or
checksums manually which is not necessary in this case and just wastes
time.

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