Backing member for DependencyProperty should have standard documentation text

Proprietary

The member backing a DependencyProperty should be documented with <summary>Identifies the <see cref="Bar"/> dependency property.</summary>, citing the registered name. Adds the summary when it is missing and corrects it when it says something else.

OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.DocumentDependencyPropertyBackingMember
mod run . --recipe=OpenRewrite.Recipes.CSharp.CodeQuality.Wpf.DocumentDependencyPropertyBackingMember

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