Add clarification for private protected

[gewarren]

Fixes #5408.

Internal preview link.

I reworded the first paragraph of the Remarks section. I added protected internal to the list of types/members extended by InternalsVisibleToAttribute. I also added a note about private protected per #5408.

cc @Youssef1313

[Youssef1313]

Fixes dotnet/docs#5408.

This a PR. I think you may have copied the wrong link.

[gewarren]

Fixes dotnet/docs#5408.

This a PR. I think you may have copied the wrong link.

Oops, that issue is actually in this repo. Thanks.

[opbld34]

Docs Build status updates of commit e133f7f:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Runtime.CompilerServices/InternalsVisibleToAttribute.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 the docs.microsoft.com contributor guides
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[gewarren]

Ping for review?

[buyaa-n]

Overall LGTM, one NIT comment

[opbld33]

Docs Build status updates of commit 8a3578a:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Runtime.CompilerServices/InternalsVisibleToAttribute.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 the docs.microsoft.com contributor guides
• Post your question in the Docs support channel