DOC: minor changes to 02-stain-normalization.ipynb

[DavidBAEpstein]

• MAINT: fix spacing around backticked words.
• DOC: Unhide hidden cells. Change "tail --line 1" to "tail -n 1" Incorporate changes implemented by pre-commit hooks.
• MAINT: Change "tail --line 1" to "tail -n 1". Correct spacing around backticked word.
• MAINT: Rewrite text cell on restarting runtime, and replace non-ascii right-arrow by ampersand encoding. Apply pre-commit hooks.

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[DavidBAEpstein]

I have merged the latest changes in develop into doc-02.
I believe this PR is ready for review.

[codecov]

Codecov Report

Merging #466 (987a856) into develop (73f9d1f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #466   +/-   ##
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  Coverage    98.63%   98.63%           
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  Files           62       62           
  Lines         5937     5937           
  Branches      1056     1056           
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  Hits          5856     5856           
  Misses          69       69           
  Partials        12       12           

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[shaneahmed]

Thanks @DavidBAEpstein