adding linux possible clear exception

[sstevens2]

fixes #1492

I added language that for some linux systems clear might also clear the scrollbuffer.

I'd also recommend making this callout a spoiler instead since it is optional content instead of content that should be highlighted. I can switch this back if maintainers disagree.

[github-actions]

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🔍 Inspect the changes: https://github.com/swcarpentry/shell-novice/compare/md-outputs..md-outputs-PR-1493

The following changes were observed in the rendered markdown documents:

 02-filedir.md | 8 ++++++--
 md5sum.txt    | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

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⏱️ Updated at 2025-10-24 10:52:12 +0000

[bkmgit]

Investigating this. Please try to wrap text at 80 characters to help readability of source files.

[sstevens2]

I'll wrap to 80 char as requested. Going forward we might want to consider semantic line breaks instead as they are more readable and accessible.

[bkmgit]

clear -x should preserve scroll back buffer https://www.man7.org/linux/man-pages/man1/clear.1.html