Fix error in the summary of the Unwrap(Task<Task>) (dotnet#8056)

Currently the summary refers to the unrelated System.Threading.Tasks.TaskScheduler.TryExecuteTaskInline method.

Author: theodorzoulias

xml/System.Threading.Tasks/TaskExtensions.xml

@@ -90,7 +90,7 @@
       </Parameters>
       <Docs>
         <param name="task">The <see langword="Task&lt;Task&gt;" /> (C#) or <see langword="Task (Of Task)" /> (Visual Basic) to unwrap.</param>
-        <summary>Creates a proxy <see cref="T:System.Threading.Tasks.Task" /> that represents the asynchronous operation of a <see cref="M:System.Threading.Tasks.TaskScheduler.TryExecuteTaskInline(System.Threading.Tasks.Task,System.Boolean)" />.</summary>
+        <summary>Creates a proxy <see cref="T:System.Threading.Tasks.Task" /> that represents the asynchronous operation of a <see langword="Task&lt;Task&gt;" /> (C#) or <see langword="Task (Of Task)" /> (Visual Basic).</summary>
         <returns>A Task that represents the asynchronous operation of the provided <see langword="System.Threading.Tasks.Task(Of Task)" />.</returns>
         <remarks>
           <format type="text/markdown"><![CDATA[