Update join types in pandas merge function

[quist00]

Closes #583

Expanded description of cross join with suggestions and added self-joins with a resource for users to explore that further on their own time if they need that approach. Joins is already a relatively heavy subject for learners to grapple with so opted not to have full pedagogical sections covering these additional join types in detail.

[github-actions[bot]]

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Rendered Changes

:mag: Inspect the changes: https://github.com/datacarpentry/python-ecology-lesson/compare/md-outputs..md-outputs-PR-584

The following changes were observed in the rendered markdown documents:

 05-merging-data.md | 12 ++++++++----
 md5sum.txt         |  2 +-
 2 files changed, 9 insertions(+), 5 deletions(-)

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:stopwatch: Updated at 2024-01-30 23:14:27 +0000

[quist00]

@sheraaronhurt assuming I understand this comment correctly "Submitted on behalf of trainee for checkout," is there github username or other identifier for that learner we can include in the comment stream for reference purposes?

[sheraaronhurt]

@quist00 Here is the information requested: rmr969