Add notes for preprints in docs

[sampan501]

Reference issue

Type of change

What does this implement/fix?

Additional information

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[codecov[bot]]

Codecov Report

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

Project coverage is 96.71%. Comparing base (8bf37e3) to head (3fec813). Report is 5 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #338      +/-   ##
==========================================
+ Coverage   96.25%   96.71%   +0.46%     
==========================================
  Files          47       84      +37     
  Lines        2296     3719    +1423     
==========================================
+ Hits         2210     3597    +1387     
- Misses         86      122      +36     

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