Formulate more clearly

[cknuepfer]

A sentence was formulated more precisely.

The formulation "Next, we will assign a file name to the variable filename..." is misleading for two reasons:

1. The assignment to $filename happens before the first step inside the loop.
2. The assignment is not done by us, the users, but by the shell interpreter.

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:mag: Inspect the changes: https://github.com/swcarpentry/shell-novice/compare/md-outputs..md-outputs-PR-1442

The following changes were observed in the rendered markdown documents:

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 md5sum.txt | 2 +-
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:stopwatch: Updated at 2023-11-09 07:51:16 +0000