Typo/trailing whitespace fixes

[rbanffy]

Fixes #729 .

Changes to the documentation, fixing typos and trailing whitespace mostly.

Review Checklist for Source Code Changes

• Does pip install still work? (Fails on 3.12 for unrelated issues)
• [N/A] Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• [N/A] Does Sorcha run successfully on a test set of input files/databases?
• [N/A] Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5a391ab) 65.31% compared to head (b0a6822) 65.31%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #733   +/-   ##
=======================================
  Coverage   65.31%   65.31%           
=======================================
  Files          67       67           
  Lines        3451     3451           
=======================================
  Hits         2254     2254           
  Misses       1197     1197           

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