Add comments for new MediaTypeNames members

[rzikm]

Add comments for new MediaTypeNames members.

Contributes to dotnet/runtime#88569.

Exported from dotnet/runtime#92220, don't merge before this one.

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Issue Details

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Add comments for new MediaTypeNames members.

Contributes to dotnet/runtime#88569.

Author:	rzikm
Assignees:	rzikm
Labels:	area-System.Net
Milestone:	-

[learn-build-service-prod]

Learn Build status updates of commit 59031fb:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Net.Mime/MediaTypeNames+Application.xml	✅Succeeded	View
xml/System.Net.Mime/MediaTypeNames+Font.xml	✅Succeeded	View
xml/System.Net.Mime/MediaTypeNames+Image.xml	✅Succeeded	View
xml/System.Net.Mime/MediaTypeNames+Multipart.xml	✅Succeeded	View
xml/System.Net.Mime/MediaTypeNames+Text.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

[antonfirsov]

Exported from dotnet/runtime#92220, don't merge before this one.

@rzikm ultimately the source of truth is the dotnet-api-docs repo, so we don't have to worry about the order.

[carlossanlop]

LGTM

[rzikm]

Exported from dotnet/runtime#92220, don't merge before this one.

@rzikm ultimately the source of truth is the dotnet-api-docs repo, so we don't have to worry about the order.

Well, yes, but there were some unresolved comments on the other PR so I wanted to wait to see if there are not some changes to be carried over to this one

[antonfirsov]

Opened #9314.