Fix broken item props

[gewarren]

Contributes to dotnet/docs#50868.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-runtime

[Copilot]

Pull request overview

Updates the XML API docs for System.Tuple<T...> explicit-interface System.Runtime.CompilerServices.ITuple.Item member to address broken xref links (dotnet/docs#50868).

Changes:

• Updates the ITuple.Item remarks xref to target Item(System.Int32) for Tuple arities 1–8.
• Switches the xref UID format from URL-encoded to a raw UID form in the updated remarks lines.
• Removes the in-markdown ## Remarks heading for Tuple arities 1 and 3 in the updated block.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
xml/System/Tuple`1.xml	Updates ITuple.Item remarks xref; also drops the ## Remarks heading in that remarks block.
xml/System/Tuple`2.xml	Updates ITuple.Item remarks xref to include the index parameter.
xml/System/Tuple`3.xml	Updates ITuple.Item remarks xref; also drops the ## Remarks heading in that remarks block.
xml/System/Tuple`4.xml	Updates ITuple.Item remarks xref to include the index parameter.
xml/System/Tuple`5.xml	Updates ITuple.Item remarks xref to include the index parameter.
xml/System/Tuple`6.xml	Updates ITuple.Item remarks xref to include the index parameter.
xml/System/Tuple`7.xml	Updates ITuple.Item remarks xref to include the index parameter.
xml/System/Tuple`8.xml	Updates ITuple.Item remarks xref to include the index parameter.

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