Move callout on long vs short options

[bkmgit]

Place it where long and short options are first introduced.

Closes #1429

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:mag: Inspect the changes: https://github.com/swcarpentry/shell-novice/compare/md-outputs..md-outputs-PR-1432

The following changes were observed in the rendered markdown documents:

 02-filedir.md | 24 ++++++++++++------------
 md5sum.txt    |  2 +-
 2 files changed, 13 insertions(+), 13 deletions(-)

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:stopwatch: Updated at 2023-08-10 05:21:30 +0000

[ErinBecker]

Thank you @bkmgit!