Rename hyperparameter tuning to refine the model

[svenvanderburg]

Fixes #270

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/carpentries-incubator/deep-learning-intro/compare/md-outputs..md-outputs-PR-380

The following changes were observed in the rendered markdown documents:

 1-introduction.md         | 14 ++++++++++----
 2-keras.md                | 15 ++++++++-------
 3-monitor-the-model.md    |  2 +-
 4-advanced-layer-types.md |  2 +-
 fig/graphviz/pipeline.dot |  4 ++--
 md5sum.txt                |  8 ++++----
 6 files changed, 26 insertions(+), 19 deletions(-)

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If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

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⏱️ Updated at 2023-11-01 13:19:27 +0000

[dsmits]

one small remark