Improve ADL and bit conversions examples as well as re-locate the latter

[mborland]

Closes: #1211
Closes: #1212

[cppalliance-bot]

An automated preview of the documentation is available at https://1221.decimal.prtest3.cppalliance.org/libs/decimal/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2025-11-06 12:22:52 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.2%. Comparing base (c6dd35a) to head (1d12331).
⚠️ Report is 37 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #1221     +/-   ##
=========================================
+ Coverage     99.2%   99.2%   +0.1%     
=========================================
  Files          257     257             
  Lines        17134   17134             
  Branches      1935    1935             
=========================================
+ Hits         16994   16995      +1     
+ Misses         140     139      -1     

see 1 file with indirect coverage changes

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