Release notes link needs to be updated (master -> main)

[Mertsch]

runtime/Directory.Build.props

Line 242 in 3149da8

<PackageReleaseNotes>https://go.microsoft.com/fwlink/?LinkID=799421</PackageReleaseNotes>

This link
https://go.microsoft.com/fwlink/?LinkID=799421
points to
https://github.com/dotnet/core/tree/master/release-notes
but should point to
https://github.com/dotnet/core/tree/main/release-notes

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-meta
See info in area-owners.md if you want to be subscribed.

[vcsjones]

@jeffhandley Do you know who owns this fwlink? Would be nice to get it to point to main instead of master to avoid the redirect banner GitHub shows when this happens.

[jeffhandley]

We updated the fwlink. Thanks for reporting this, @Mertsch.