More proper definition of task example

[OnurGumus]

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Document Details

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Async.StartAsTask should be Async.StartImmediateAsTask

• ID: e2dea170-a8f4-90f6-e578-e406fb43fef1
• Version Independent ID: 885f9f09-d2ff-112c-6dda-9a31bccc0e8a
• Content: What's new in F# 6 - F# Guide
• Content Source: docs/fsharp/whats-new/fsharp-6.md
• Product: dotnet-fsharp
• GitHub Login: @cartermp
• Microsoft Alias: dotnetcontent

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Associated WorkItem - 497723

[BillWagner]

To fix this, a definition for task expressions should be added, and it should link to this page: https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/task-expressions