628 explicit df names

[sjvrijn]

Fix #628

Episode 8:

• Renamed df to europe

Episode 16:

• Renamed df to asia for the first specific case
• Renamed df to countries in the function writing exercise, since the generic continent is already used

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Rendered Changes

:mag: Inspect the changes: https://github.com/swcarpentry/python-novice-gapminder/compare/md-outputs..md-outputs-PR-654

The following changes were observed in the rendered markdown documents:

 08-data-frames.md       |  8 ++++----
 16-writing-functions.md | 14 +++++++-------
 md5sum.txt              |  4 ++--
 3 files changed, 13 insertions(+), 13 deletions(-)

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:stopwatch: Updated at 2023-07-24 18:17:26 +0000

[martinosorb]

Hi @sjvrijn, thanks for the PR. It looks good, but I have a comment: episode 07 uses data_oceania instead. I suggest we use data_europe etc. (or change the other one to oceania, but I like the first option better, personally).

[sjvrijn]

@martinosorb good point for consistency, I've updated my changes.

[martinosorb]

LGTM. Merging!