Add documentation for Visual Basic -pathmap compiler option

[Copilot]

• Create comprehensive documentation for Visual Basic -pathmap compiler option
• Add pathmap to compiler options listed alphabetically
• Add pathmap to compiler options listed by category
• Apply code review suggestions:
  • Update ms.date to current date (09/04/2025)
  • Fix table header formatting in Arguments section
  • Convert numbered list to unordered list in Remarks section
  • Add pathmap to Visual Basic TOC in alphabetical order

All feedback from @BillWagner and @gewarren has been addressed. The documentation is now complete and properly integrated into the Visual Basic documentation structure.

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Internal previews

📄 File	🔗 Preview link
docs/visual-basic/reference/command-line-compiler/compiler-options-listed-alphabetically.md	docs/visual-basic/reference/command-line-compiler/compiler-options-listed-alphabetically
docs/visual-basic/reference/command-line-compiler/compiler-options-listed-by-category.md	docs/visual-basic/reference/command-line-compiler/compiler-options-listed-by-category
docs/visual-basic/reference/command-line-compiler/pathmap.md	docs/visual-basic/reference/command-line-compiler/pathmap
docs/visual-basic/toc.yml	docs/visual-basic/toc

[BillWagner]

Once I take the suggestions, this is ready for final review.