Update remove-unneeded-files sol'n 4 in lesson 4 (issue #1415)

[sdrobert]

This PR is follows up issue #1415.

In the removing-unneeded-files question of lesson 4, the description of the 4th solution

The shell would expand `*.*` to match all files with any extension, so this command would delete all files

has been replaced with

The shell expands `*.*` to match all filenames containing at least one `.`, including the processed files (`.txt`) *and* raw files (`.dat`)

Note that the replacement text is slightly different from that suggested in #1415. I can easily use that text if the maintainers would prefer.

Best,
Sean

[github-actions]

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 04-pipefilter.md | 4 ++--
 md5sum.txt       | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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⏱️ Updated at 2023-07-19 07:20:15 +0000