fix: broken or unwanted link pathTooLongException

[Ankush1oo8]

Summary

Describe your changes here.
In the remarks section, there's a link to Long Paths in .NET.

Now updated to

intended target of the link. I would be convenient if the link were updated.

Fixes #10404 (if available)

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-io

[learn-build-service-prod]

Learn Build status updates of commit e4be09a:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.IO/PathTooLongException.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[BillWagner]

Waiting for the runtime team to review as well. I had one comment on the URL format

[learn-build-service-prod]

Learn Build status updates of commit cad7bbc:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.IO/PathTooLongException.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel