Updated questions at the start of "advanced containers"

[jcohen02]

This addresses #234. The questions now rather duplicate the objectives - not sure whether we want to update further but this does add some clarity as noted in the related issue.

Closes #234.

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries-incubator/docker-introduction/compare/md-outputs..md-outputs-PR-239

The following changes were observed in the rendered markdown documents:

 advanced-containers.md | 6 +++++-
 md5sum.txt             | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

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⏱️ Updated at 2024-07-31 18:01:39 +0000

[aturner-epcc]

LGTM