Add missing api doc for System.Net.HttpVersion

[aik-jahoda]

part of: dotnet/runtime#41446

[ManickaP]

Version30 has been removed: https://github.com/dotnet/runtime/blob/master/src/libraries/System.Net.Primitives/ref/System.Net.Primitives.cs#L205-L211
https://github.com/dotnet/runtime/pull/40468/files#diff-03c1aae84de79481c30bdcd38f3ef9bd
cc: @scalablecory

[aik-jahoda]

I have removed whole member section

[opbld34]

Docs Build status updates of commit 04a3aab:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Net/HttpVersion.xml	✅Succeeded	View

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[opbld30]

Docs Build status updates of commit 11bed03:

❌ Validation status: errors

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[opbld31]

Docs Build status updates of commit 8cfcdd2:

❌ Validation status: errors

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	❌Error		Details

• [Error-GitCommitDoesNotExist] Cannot sync git repo to specified commit because commit 8cfcdd22d949a27fb43f8c3fbabc4bdb20151860 doesn't exist. It might be caused your branch is deleted or force pushed. If it is not this case, please open a ticket on https://SiteHelp

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[ManickaP]

Content-wise LGTM.

[ManickaP]

I'm not sure how docs and auto-generating tools will handle this removal.
Maybe it should be left with To be added. (which is skipped) until auto-removed. If that's what the tool will do once it sees the property is gone.

[aik-jahoda]

I believe the tool will recreate the section once it discover the api again. By the way it should also fill comments from /// in code during first run.

@carlossanlop am I right?

[carlossanlop]

Don't remove APIs manually.

If this is an API that has been removed from runtime, then we have to wait for the MS Docs build system to catch up and remove it automatically.

Is this API gone in Preview8 or above? Because we haven't updated MS Docs yet with that preview.

[opbld30]

Docs Build status updates of commit 83bc3b1:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Net/HttpVersion.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:

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[carlossanlop]

I'm closing this PR since we should not manually modify the autogenerated xmls.