Update instructor-notes.md

[woodstaylor]

Removed redundant set up information from instructor notes.

[github-actions]

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🔍 Inspect the changes: https://github.com/datacarpentry/r-socialsci/compare/md-outputs..md-outputs-PR-477

The following changes were observed in the rendered markdown documents:

 instructor-notes.md | 73 +----------------------------------------------------
 md5sum.txt          |  2 +-
 2 files changed, 2 insertions(+), 73 deletions(-)

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⏱️ Updated at 2023-08-10 14:54:04 +0000

[juanfung]

@woodstaylor this is great! Thank you so much for cleaning up the instructor notes!