Doc: Expand total function docs

[JSAbrahams]

Summary

• Also some small bug fixes in language, particular compilation portion
• Lots of cleanup to prepare for a release, representing a clean slate of sorts

[codecov]

Codecov Report

❌ Patch coverage is 94.82759% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.51%. Comparing base (c8e96a6) to head (40639c1).

Files with missing lines	Patch %	Lines
src/backend/cranelift/convert/definition.rs	84.61%	2 Missing ⚠️
src/backend/cranelift/convert/control_flow.rs	95.45%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #497   +/-   ##
========================================
  Coverage    92.50%   92.51%           
========================================
  Files          113      113           
  Lines        15709    15741   +32     
========================================
+ Hits         14531    14562   +31     
- Misses        1178     1179    +1     

Files with missing lines	Coverage Δ
src/backend/cranelift/convert/mod.rs	89.92% <100.00%> (+2.31%)	⬆️
src/backend/python/ast/mod.rs	94.11% <100.00%> (+0.07%)	⬆️
src/backend/cranelift/convert/control_flow.rs	92.56% <95.45%> (-0.30%)	⬇️
src/backend/cranelift/convert/definition.rs	89.52% <84.61%> (-0.48%)	⬇️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.