Typo "/libpath"→"-libpath"

[hyoshioka0128]

https://docs.microsoft.com/en-us/dotnet/visual-basic/reference/command-line-compiler/libpath

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

[Youssef1313]

Both are correct. But dotnet team is standardizing on the - instead of the /.

There is another occurrence at the following sentence:

To set /libpath in the Visual Studio integrated development environment

You may edit it as well.

[mairaw]

Thanks @hyoshioka0128! Your contributions should go live within a day.