fix incorrect wrapping_mul doc

[DaniPopes]

Motivation

Uint::wrapping_mul has the same rustdoc as Uint::saturating_mul, incorrectly stating that it saturates instead of overflowing

Solution

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@d6f8288). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head ac0a1c8 differs from pull request most recent head dbf498b. Consider uploading reports for the commit dbf498b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #218   +/-   ##
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  Coverage        ?   84.39%           
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  Files           ?       49           
  Lines           ?     5870           
  Branches        ?        0           
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  Hits            ?     4954           
  Misses          ?      916           
  Partials        ?        0           

Impacted Files	Coverage Δ
src/mul.rs	93.18% <ø> (ø)

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