Display update command for Composer on the available updates form

I just went to update my personal site and didn't feel like running a full composer update. I had a few upgrades required.

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I ended up having to manually write this command

composer update \ 
    drupal/token \
    drupal/metatag \
    drupal/media_entity_twitter \
    drupal/indieweb \
    drupal/embed \
    drupal/editor_advanced_link \
    drupal/contact_storage \
    --with-dependencies

This could be generated and copied from the update form for end users.