Fix docs for replace and replace!

[ph-kev]

The documentation for replace and replace! is not correct and misformatted. This PR fixes this by giving it proper documentation.

I asked a LLM to make the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.54%. Comparing base (7652c03) to head (49df3ef).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #439   +/-   ##
=======================================
  Coverage   99.54%   99.54%           
=======================================
  Files          20       20           
  Lines        2392     2392           
=======================================
  Hits         2381     2381           
  Misses         11       11           

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