MSBuild: remove unresolved refs

[ghogen]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

[ghogen]

I didn't resolve the CircularDependencyException reference, because that appears to be a substantive record of an exception that could be thrown, but it's in Microsoft.Build.Backend, which is not published. So, asked @rainersigwald about how to resolve this.

[opbld32]

Docs Build status updates of commit c4444ce:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/Microsoft.Build.Evaluation/Project.xml	✅Succeeded	View
xml/Microsoft.Build.Evaluation/ProjectCollection.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching in the Docs contributor and Admin Guide
• See the frequently asked questions
• Post your question in the Docs support channel

[opbld32]

Docs Build status updates of commit 78f32f7:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/Microsoft.Build.Evaluation/Project.xml	✅Succeeded	View
xml/Microsoft.Build.Evaluation/ProjectCollection.xml	✅Succeeded	View
xml/Microsoft.Build.Graph/ProjectGraph.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching in the Docs contributor and Admin Guide
• See the frequently asked questions
• Post your question in the Docs support channel

[ghogen]

#sign-off

[ghogen]

@v-alje Can you merge this? I resolved the question about CircularDependencyException, so we're good to go with this change to fix the warnings in the other PR: #4939