Minor edit docs

[gnawin]

(description of changes)

Fixes # (issue)

Checklist before merging

• Documentation is up-to-date
• Unit tests have been added/updated accordingly
• Code has been formatted according to SpineOpt's style
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.81%. Comparing base (d74a797) to head (24328e0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1098   +/-   ##
=======================================
  Coverage   86.81%   86.81%           
=======================================
  Files         143      143           
  Lines        4125     4125           
=======================================
  Hits         3581     3581           
  Misses        544      544           

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