Document the nichart mode

[tsalo]

Closes none. Follows up on #1320.

Changes proposed in this pull request

• Document nichart mode.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.03%. Comparing base (5df76de) to head (44af9ac).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1325      +/-   ##
==========================================
- Coverage   79.04%   79.03%   -0.02%     
==========================================
  Files          59       59              
  Lines        7412     7408       -4     
  Branches      961      961              
==========================================
- Hits         5859     5855       -4     
  Misses       1261     1261              
  Partials      292      292              

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