Man pages: refactor common options: arch

Smaller, more reviewable chunks.

This is just one option, --arch. Future PRs may, if the reviewing
is easy, include multiple options. This one includes fixes to
the preprocessor script, though:

 * big oops, I was not handling '<<something pod|something>>'
   where 'pod' appears other than the beginning of the string.
 * I was also not handling 'container<<| or pod>>', where one
   side was empty.
 * Behavior change: <<subcommand>>, on podman-pod-foo,
   becomes just 'foo' (not 'pod foo'). This will be useful
   in a future PR where we refactor --pod-id-file.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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