Adding filters to deriviatives.md and resolves.md

[dnguyen227]

Summary

This PR fixes/implements the following bugs/features

Doctest fragility — incidental integers (source line numbers, solver iteration counts) break doctests on version drift

The doctest in docs/src/guide/derivative.md filters on a hardcoded line number (scalar_parameters.jl:807), which fails whenever that source line shifts. Two jldoctest quick blocks in docs/src/tutorials/resolves.md also assert exact barrier_iterations counts that depend on the Ipopt build.

The fix replaces the line-specific filter with r"\d+" in derivative.md's DocTestFilters, and adds ; filter = r"\d+" to the two affected blocks in resolves.md — 3 lines total.

Closing issues

Fixes #426

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.77%. Comparing base (ca087ad) to head (f824822).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #427   +/-   ##
=======================================
  Coverage   99.77%   99.77%           
=======================================
  Files          38       38           
  Lines        6588     6588           
=======================================
  Hits         6573     6573           
  Misses         15       15           

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[pulsipher]

Thanks!