Remove erroneous -a flag from apt-get synopsis in manpage

The -a flag exists for apt-cache (--all-versions) and -a=arch is
actually an (also documented) option to set host architecture – as the
apt-get manpage documents further below setting a host arch makes sense
only for those commands that actually need one set like source and
build-dep, so other commands keep refusing the option as unsupported as
they should be.

So this commit does indeed just remove a single character from
documentation with no other practical effect.

See: #1061148

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