Improve 'touch' command in reference

[kaitlinnewson]

Add details about the touch command to note that it creates files, as that's what we do with it in this lesson.

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Rendered Changes

:mag: Inspect the changes: https://github.com/LibraryCarpentry/lc-shell/compare/md-outputs..md-outputs-PR-245

The following changes were observed in the rendered markdown documents:

 md5sum.txt   | 2 +-
 reference.md | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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:stopwatch: Updated at 2023-09-08 14:18:40 +0000