Document Using(StringComparison) and Using(CultureInfo) modifiers for string constraints

[Copilot]

Documents NUnit PR #5052 which adds .Using(StringComparison) and .Using(CultureInfo) modifiers to SubstringConstraint, StartsWithConstraint, and EndsWithConstraint.

Changes

• SubstringConstraint.md: Added new modifiers and usage examples
• StartsWithConstraint.md: Added new modifiers and usage examples
• EndsWithConstraint.md: Added new modifiers and usage examples

New Modifiers

...Using(StringComparison comparisonType)
...Using(CultureInfo culture)

Example Usage

// StringComparison
Assert.That("Hello World!", Does.Contain("WORLD").Using(StringComparison.OrdinalIgnoreCase));

// CultureInfo with case-insensitive matching
Assert.That("TITLE text", Does.StartWith("title").IgnoreCase.Using(new CultureInfo("tr-TR")));

// CultureInfo alone (case-sensitive)
Assert.That("Main Straße", Does.EndWith("Straße").Using(new CultureInfo("de-DE")));

Only one Using modifier may be specified per constraint.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Document Allow string comparison specification for string constraints</issue_title>
<issue_description>NUnit PR #5052 should be documented.

@nancyhuyn : Would you like to give this a spin too , since you implemented the PR ?</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: NUnit.Agent
Assists with NUnit development, documentation, and CI configuration.

• Fixes Document Allow string comparison specification for string constraints #1096

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[SeanKilleen]

Nice!