Fix CUDA pessimization and improve docs

[mborland]

No description provided.

[mborland]

Tested on device here: cppalliance#4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (02583a1) to head (68126c8).
⚠️ Report is 26 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #294   +/-   ##
========================================
  Coverage    94.85%   94.86%           
========================================
  Files           74       74           
  Lines         9007     9009    +2     
========================================
+ Hits          8544     8546    +2     
  Misses         463      463           

Files with missing lines	Coverage Δ
.../boost/charconv/detail/from_chars_integer_impl.hpp	100.00% <ø> (ø)
...ude/boost/charconv/detail/integer_search_trees.hpp	99.25% <100.00%> (ø)
include/boost/charconv/detail/memcpy.hpp	50.00% <ø> (ø)
...de/boost/charconv/detail/to_chars_integer_impl.hpp	96.89% <ø> (ø)

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