Make DocumentationGenerator ignore trailing whitespace differences

[Copilot]

The DocumentationGenerator exits with a non-zero code when generated content differs from existing files, breaking CI. Files with identical content except for trailing newlines/spaces were triggering unnecessary failures.

Change

Modified WriteFileIfChanged to use TrimEnd() when comparing existing and new content:

// Before
if (existingContent != content)

// After  
if (existingContent.TrimEnd() != content.TrimEnd())

This treats files as unchanged when they differ only in trailing whitespace (newlines, spaces, tabs), preventing spurious CI failures while preserving detection of actual content changes.

Original prompt

Can you make the DocumentationGenerator less strict when comparing new content with existing content. Sometimes it fails because a new line is missing at the end of the document, breaking the CI. Can you be more lax and handle this kind of differences

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