Document relative path limitation and add cross-platform examples for F# Interactive #i directive

[Copilot]

Fixes #44256

Summary

This PR addresses a documentation gap in the F# Interactive reference regarding the #i directive for specifying package sources. The documentation now clearly states that relative paths are not supported and provides comprehensive cross-platform examples.

Problem

Users were unclear whether relative paths work with the #i directive when specifying local package sources in F# Interactive. The documentation only showed a Windows absolute path example, leaving macOS and Linux users without guidance. For example, a user attempting to use:

#i "./my/local/packages"

would encounter an error with no explanation in the documentation about why this doesn't work or what the alternative is.

Changes

1. Added cross-platform absolute path examples

   • macOS: /Users/username/path/to/my/local/source
   • Linux: /home/username/path/to/my/local/source
   • Maintained existing Windows and remote URL examples

2. Added IMPORTANT callout clarifying that:

   • Relative paths aren't currently supported with the #i directive
   • Absolute paths must be used for local package sources
   • References tracking issue dotnet/fsharp#12969
   • Provides workaround using __SOURCE_DIRECTORY__ combined with System.IO.Path.Combine()

3. Improved documentation quality

   • Used active voice and contractions for better readability
   • Fixed terminology (changed "package references" to "package sources")
   • Added ai-usage: ai-assisted frontmatter metadata
   • Updated ms.date to reflect current changes

Testing

Validated the behavior by testing F# Interactive:

• ✅ Confirmed relative paths fail with "Invalid URI" error
• ✅ Confirmed absolute paths work correctly across platforms
• ✅ Verified documentation follows Microsoft style guidelines

Impact

This change directly answers the user's question and prevents confusion for developers trying to use local package sources in F# Interactive scripts on macOS and Linux. The documentation now provides clear guidance on what works, what doesn't, and why.

Original prompt

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This section details on the original issue you should resolve

<issue_title>relative path for local package source - dotnet fsi (F#)</issue_title>
<issue_description>Hi i was trying to specify relative path on a mac for the package source in F# interactive (dotnet fsi), does that work or is there any workaround?

#i " ./my/local/packages"

Thanks,
have a great day

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Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: db36a87c-0928-52ce-38f3-1555e450cce1
• Version Independent ID: 400ddb93-a841-963b-58cc-21f506b13b61
• Content: F# Interactive (dotnet) Reference
• Content Source: docs/fsharp/tools/fsharp-interactive/index.md
• Product: dotnet-fsharp
• GitHub Login: @cartermp
• Microsoft Alias: dotnetcontent</issue_description>

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

@BillWagner ping @KathleenDollard @dsyme @BillWagner The docs should include a relative path example for `#i`. Alternatively, if relative paths aren't allowed, that should be stated.

Fixes #28973

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