More reference cell documentation

[fredrikekre]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.75%. Comparing base (bdd5b41) to head (1549cfa). Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #689   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files          36       36           
  Lines        5441     5441           
=======================================
  Hits         5101     5101           
  Misses        340      340           

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