Improve docs

[sunxd3]

Should solve #135

[coveralls]

Pull Request Test Coverage Report for Build 8060423390

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.293%

---

Totals
Change from base Build 8054101747:	0.0%
Covered Lines:	1479
Relevant Lines:	1842

---

💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.29%. Comparing base (8f63957) to head (51b9438).

❗ Current head 51b9438 differs from pull request most recent head ade1903. Consider uploading reports for the commit ade1903 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #142   +/-   ##
=======================================
  Coverage   80.29%   80.29%           
=======================================
  Files          21       21           
  Lines        1842     1842           
=======================================
  Hits         1479     1479           
  Misses        363      363           

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[github-actions]

[JuliaFormatter] _{reported by reviewdog 🐶}

Suggested change

	"User-defined Functions and Distributions" => "user_defined_functions.md"
	"User-defined Functions and Distributions" => "user_defined_functions.md",