Expanding constraint examples

[OsirisTerje]

Updated the comparison constraints, including examples.

[Copilot]

Pull request overview

This PR expands the NUnit comparison-constraint documentation by adding richer, snippet-backed examples (including custom comparer usage) and updating the constraint pages to describe supported comparable types.

Changes:

• Extended ConstraintExamples.cs with new GreaterThan/GreaterThanOrEqual/LessThan/LessThanOrEqual examples plus custom comparer implementations.
• Switched multiple constraint docs to reference snippet regions via DocFX includes and added brief “supported types” descriptions.
• Minor cleanups/formatting tweaks in snippet examples.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
docs/snippets/Snippets.NUnit/ConstraintExamples.cs	Adds new comparison constraint examples and custom comparer helper types for doc snippets.
docs/articles/nunit/writing-tests/constraints/GreaterThanConstraint.md	Adds supported-types description and includes comparer snippet.
docs/articles/nunit/writing-tests/constraints/GreaterThanOrEqualConstraint.md	Adds supported-types description and switches examples to snippet includes.
docs/articles/nunit/writing-tests/constraints/LessThanConstraint.md	Adds supported-types description and includes comparer snippet.
docs/articles/nunit/writing-tests/constraints/LessThanOrEqualConstraint.md	Adds supported-types description and switches examples to snippet includes.
docs/articles/nunit/writing-tests/constraints/EqualConstraint.md	Adds supported-types description for EqualConstraint.

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