Fix indentation errors

[LiamPattinson]

Resolves #15

Also resolves a few typos I found in passing.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/ResearchCodingClub/python-testing-for-research/compare/md-outputs..md-outputs-PR-16

The following changes were observed in the rendered markdown documents:

 01-why-test-my-code.md          |  50 +++----
 02-simple-tests.md              |  34 ++---
 04-unit-tests-best-practices.md |   8 +-
 05-testing-exceptions.md        |   8 +-
 07-fixtures.md                  | 287 ++++++++++++++++++++--------------------
 08-parametrization.md           | 183 +++++++++++++------------
 md5sum.txt                      |  12 +-
 7 files changed, 289 insertions(+), 293 deletions(-)

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⏱️ Updated at 2026-02-17 11:23:10 +0000