XML documentation generated from docs should not contain docs-relative URLs

[Powerhelmsman]

This issue was created by @svick from MicrosoftDocs/feedback#659

Describe the bug
When looking at the XML documentation for an API that seems to have been generated from .Net API reference, such as netstandard.xml, I can see docs-relative URLs such as ~/docs/standard/base-types/regular-expression-options.md, while I think it should point to the live URL for the article: https://docs.microsoft.com/dotnet/standard/base-types/regular-expression-options.
Specifically, netstandard.xml (from version 2.0.3 of the NETStandard.Library package) contains (reformatted):
<member name="F:System.Text.RegularExpressions.RegexOptions.Singleline">
<summary>
Specifies single-line mode. Changes the meaning of the dot (.) so it matches every
character (instead of every character except \n). For more information, see the
"Single-line Mode" section in the
<see cref="~/docs/standard/base-types/regular-expression-options.md">
Regular Expression Options</see> topic.</summary>
<returns></returns>
</member>
Notice how the <see cref> contains a URL that does not make sense outside of the docs repo.
This content seems to come from this line in dotnet/dotnet-api-docs.
Expected behavior
XML documentation contains links to live versions of linked articles.
Note that while there doesn't seem to be spec-approved way provide HTTP links in XML documentation, ReSharper/Rider seems to accept <a href>, and there is a proposal to adopt <see href>: dotnet/csharplang#1764, which is also used by Sandcastle.
Screenshots
This is how the XML documentation is currently presented in Rider, where the link is not very useful:

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Document Details

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• ID: bf9b6611-d08f-2fe9-216b-e0658d7f1553
• Version Independent ID: 3d3be892-b9b5-ca0b-1193-9fa49716decb
• Content: Regular Expression Options
• Content Source: docs/standard/base-types/regular-expression-options.md
• Product: dotnet
• GitHub Login: @rpetrusha
• Microsoft Alias: ronpet

[mairaw]

I've checked what's being produced by our latest IntelliSense builds and the link is no longer there (this has been the behavior of how we render links on IntelliSense):

    <member name="F:System.Text.RegularExpressions.RegexOptions.Singleline">
      <summary>Specifies single-line mode. Changes the meaning of the dot (.) so it matches every character (instead of every character except \n). For more information, see the "Single-line Mode" section in the Regular Expression Options topic.</summary>
    </member>

We'd now need to update the .NET Standard package with the latest version of our IntelliSense files.
@ahsonkhan @safern can you guys help with this?