Fix matrix example syntax in troubleshooting docs

[thomhurst]

Fixes the matrix test explosion example to use the actual [MatrixDataSource] and [Matrix] syntax instead of [Arguments].

Closes #4590

🤖 Generated with Claude Code

[thomhurst]

Summary

Updates the Matrix Test Explosion example in troubleshooting documentation to use the correct [MatrixDataSource] syntax.

Critical Issues

None found ✅

Suggestions

The documentation change is accurate and improves clarity. The updated example correctly demonstrates:

• Using [MatrixDataSource] attribute on the test method
• Using [Matrix(...)] attributes on individual parameters
• The resulting combinatorial explosion (5 × 5 × 2 = 50)

The previous example used multiple [Arguments] attributes which would have generated 12 test cases (3 from the three [Arguments] lines, each with different argument counts), not a 50-case matrix explosion. The corrected example properly illustrates the troubleshooting scenario.

One minor suggestion: Consider adding using TUnit.Core; to the example snippet for completeness, though it's not critical for a troubleshooting doc.

Verdict

✅ APPROVE - No critical issues