fix: fix import to right file in examples

[stevenhua0320]

@sbillinge Ready to review. Note that in the tools_example.rst it does not have the documentation of compute_mud, which is referenced in another issue #291

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (30407bf) to head (6d33a29).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #364   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          520       520           
=========================================
  Hits           520       520           

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