Fix outdated float64 doc comments in helper package

[whencanibe]

Describe Request

Doc comments in the helper package still referenced float64 despite the functions having been migrated to generics. This PR updates the comments in all 20 affected files to accurately reflect the generic type parameters (T, F) used in their signatures.

Change Type

Documentation fix (no functional changes)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.13%. Comparing base (e86d913) to head (6d1fb8c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #353   +/-   ##
=======================================
  Coverage   93.13%   93.13%           
=======================================
  Files         215      215           
  Lines        6190     6190           
=======================================
  Hits         5765     5765           
  Misses        344      344           
  Partials       81       81           

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