Add linter doctests

[ReubenJ]

All changes in src and test are a result of running the formatting script.

[codecov]

Codecov Report

Attention: Patch coverage is 62.82051% with 87 lines in your changes missing coverage. Please review.

Project coverage is 66.66%. Comparing base (24c3600) to head (afdb86c).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
src/heuristics.jl	14.28%	36 Missing ⚠️
src/sampling_grammar.jl	34.61%	17 Missing ⚠️
src/program_iterator.jl	80.48%	8 Missing ⚠️
src/top_down_iterator.jl	60.00%	8 Missing ⚠️
src/fixed_shaped_iterator.jl	0.00%	7 Missing ⚠️
src/random_iterator.jl	73.33%	4 Missing ⚠️
src/evaluate.jl	66.66%	2 Missing ⚠️
src/stochastic_functions/neighbourhood.jl	0.00%	2 Missing ⚠️
src/uniform_iterator.jl	80.00%	2 Missing ⚠️
src/stochastic_functions/accept.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
- Coverage   67.35%   66.66%   -0.69%     
==========================================
  Files          21       21              
  Lines         729      756      +27     
==========================================
+ Hits          491      504      +13     
- Misses        238      252      +14     

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[ReubenJ]

Failing code coverage is because of the many lines that have changed due to reformatting. Codecov reports that tests do not cover the changes in this PR, but these were not covered before either, and the changes were just formatting.

[ReubenJ]

Will likely not use this approach in favor of BestieTemplate.jl