Update examples and signatures in docstrings

[abhro]

• Indent method signatures for markdown
• Change syntax highlighting tag from julia to julia-repl
• Ignore /docs/build/ folder

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.51%. Comparing base (97b9fe8) to head (9ec9164).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #506      +/-   ##
==========================================
+ Coverage   61.35%   61.51%   +0.15%     
==========================================
  Files          16       16              
  Lines         634      634              
==========================================
+ Hits          389      390       +1     
+ Misses        245      244       -1     

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