Documentation about the DataFormats.Html field is in the wrong repo

The documentation for the Clipboard class' data formats includes information about the [DataFormats.Html](https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.dataformats.html?view=net-5.0) field. This page does not contain details of the required format of the HTML; instead, it links to a pre-existing page in the **Remarks** section (see [https://github.com/dotnet/dotnet-api-docs/blob/3c367d244e5d6df445c095410037b186f7076177/xml/System.Windows.Forms/DataFormats.xml#L506](https://github.com/dotnet/dotnet-api-docs/blob/3c367d244e5d6df445c095410037b186f7076177/xml/System.Windows.Forms/DataFormats.xml#L506)).

However, the [target page](https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/aa767917(v=vs.85)) is currently located within the documentation for Internet Explorer and therefore flagged as _'no longer being updated'_. It therefore risks being lost as the IE documentation becomes more out-of-date and/or potentially made unavailable.

As this information is broadly relevant to Windows applications in general, and is not specific to Internet Explorer, it would be more appropriate if the article were moved/duplicated in this section of the docs (the clipboard format is a subset of HTML so quite specific to this topic).

Start by reviewing the referenced DataFormats.xml entry around line 506 and the linked Internet Explorer article to compare the existing guidance. Determine the appropriate documentation location for the HTML clipboard format, then ensure the relevant API documentation points to maintained content rather than the legacy IE page.

Scritto dal modello di indicizzazione a partire dal testo della issue.