Improve documentation

[akx]

This PR adds documentation for some previously undocumented functions and removes obsolete things.

Fixes #1255 (as it happens).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.04%. Comparing base (68999b1) to head (80f1912).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1256   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files          27       27           
  Lines        4715     4715           
=======================================
  Hits         4340     4340           
  Misses        375      375           

Flag	Coverage Δ
macos-14-3.10	91.09% <ø> (ø)
macos-14-3.11	91.02% <ø> (ø)
macos-14-3.12	91.24% <ø> (ø)
macos-14-3.13	91.24% <ø> (ø)
macos-14-3.14	91.21% <ø> (ø)
macos-14-3.8	90.95% <ø> (ø)
macos-14-3.9	91.02% <ø> (ø)
macos-14-pypy3.10	91.09% <ø> (ø)
ubuntu-24.04-3.10	91.11% <ø> (ø)
ubuntu-24.04-3.11	91.04% <ø> (ø)
ubuntu-24.04-3.12	91.26% <ø> (ø)
ubuntu-24.04-3.13	91.26% <ø> (ø)
ubuntu-24.04-3.14	91.24% <ø> (ø)
ubuntu-24.04-3.8	90.98% <ø> (ø)
ubuntu-24.04-3.9	91.04% <ø> (ø)
ubuntu-24.04-pypy3.10	91.11% <ø> (ø)
windows-2022-3.10	91.10% <ø> (ø)
windows-2022-3.11	91.04% <ø> (ø)
windows-2022-3.12	91.25% <ø> (ø)
windows-2022-3.13	91.25% <ø> (ø)
windows-2022-3.14	91.23% <ø> (ø)
windows-2022-3.8	91.07% <ø> (ø)
windows-2022-3.9	91.03% <ø> (ø)
windows-2022-pypy3.10	91.10% <ø> (ø)

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