Documentation updates

[abhro]

• Convert example blocks to doctest blocks

  doctests are currently not part of the test suite or the documentation builder, but converting example blocks can help make sure the docs are always reflective of the code, and as a bonus they syntax highlight Julia REPL sessions properly

• Fix warning admonition blocks

• Update minor formatting

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.68%. Comparing base (6202fa4) to head (4a37ed9).
Report is 16 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1388       +/-   ##
===========================================
+ Coverage    3.95%   79.68%   +75.72%     
===========================================
  Files          51       51               
  Lines        4824     4908       +84     
===========================================
+ Hits          191     3911     +3720     
+ Misses       4633      997     -3636     

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