Refine the docs for ValueTuple Extension Methods

The page cannot render properly...... At least on my Firefox.
The title is too long for this page. Maybe a _longer_ screen is needed to read it properly

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* ID: e7abb6fd-23c7-e9de-aac5-8637da976717
* Version Independent ID: 128969e7-26fe-435f-5009-3ee55cca13b4
* Content: [TupleExtensions.ToTuple Method (System)](https://docs.microsoft.com/en-us/dotnet/api/system.tupleextensions.totuple?view=netframework-4.7.2#System_TupleExtensions_ToTuple__21_System_ValueTuple___0___1___2___3___4___5___6_System_ValueTuple___7___8___9___10___11___12___13_System_ValueTuple___14___15___16___17___18___19___20____)
* Content Source: [xml/System/TupleExtensions.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System/TupleExtensions.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**