Add missing maxLength parameter to XML documentation

[Copilot]

Addresses code review feedback on #1648 - the ReplaceAll method's XML documentation was missing the maxLength parameter.

Changes

• Added <param name="maxLength"> documentation tag to CrossChunkMatcher.ReplaceAll method

/// <param name="builder">The StringBuilder to search and modify</param>
/// <param name="maxLength">Maximum length of patterns to search for</param>
/// <param name="context">User context passed to callbacks</param>

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